diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c610c89eeaf3..a00822872a84f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added missing javadocs for `:distribution:tools` modules ([#4483](https://github.com/opensearch-project/OpenSearch/pull/4483))
 - Add BWC version 2.3.1 ([#4513](https://github.com/opensearch-project/OpenSearch/pull/4513))
 - [Segment Replication] Add snapshot and restore tests for segment replication feature ([#3993](https://github.com/opensearch-project/OpenSearch/pull/3993))
+- Added missing javadocs for `:example-plugins` modules ([#4540](https://github.com/opensearch-project/OpenSearch/pull/4540))
 
 ### Dependencies
 - Bumps `reactive-streams` from 1.0.3 to 1.0.4
diff --git a/gradle/missing-javadoc.gradle b/gradle/missing-javadoc.gradle
index 248a714f4f3e3..a1fde7637796c 100644
--- a/gradle/missing-javadoc.gradle
+++ b/gradle/missing-javadoc.gradle
@@ -95,14 +95,6 @@ configure([
   project(":client:client-benchmark-noop-api-plugin"),
   project(":client:rest-high-level"),
   project(":client:test"),
-  project(":doc-tools"),
-  project(":example-plugins:custom-settings"),
-  project(":example-plugins:custom-significance-heuristic"),
-  project(":example-plugins:custom-suggester"),
-  project(":example-plugins:painless-allowlist"),
-  project(":example-plugins:rescore"),
-  project(":example-plugins:rest-handler"),
-  project(":example-plugins:script-expert-scoring"),
   project(":libs:opensearch-cli"),
   project(":libs:opensearch-core"),
   project(":libs:opensearch-dissect"),
@@ -155,9 +147,7 @@ configure([
   project(":plugins:store-smb"),
   project(":plugins:transport-nio"),
   project(":qa:die-with-dignity"),
-  project(":qa:os"),
   project(":qa:wildfly"),
-  project(":rest-api-spec"),
   project(":test:external-modules:test-delayed-aggs"),
   project(":test:fixtures:azure-fixture"),
   project(":test:fixtures:gcs-fixture"),
diff --git a/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/ExampleCustomSettingsConfig.java b/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/ExampleCustomSettingsConfig.java
index 8413a750e2741..cb2e28210faf1 100644
--- a/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/ExampleCustomSettingsConfig.java
+++ b/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/ExampleCustomSettingsConfig.java
@@ -94,8 +94,13 @@ public class ExampleCustomSettingsConfig {
     private final List<Integer> list;
     private final String filtered;
 
+    /**
+     * Instantiate this object based on the specified environment.
+     *
+     * @param environment The environment including paths to custom setting configuration files
+     */
     public ExampleCustomSettingsConfig(final Environment environment) {
-        // Elasticsearch config directory
+        // OpenSearch config directory
         final Path configDir = environment.configDir();
 
         // Resolve the plugin's custom settings file
@@ -121,22 +126,47 @@ public ExampleCustomSettingsConfig(final Environment environment) {
         assert secured != null;
     }
 
+    /**
+     * Gets the value of the custom.simple String setting.
+     *
+     * @return the custom.simple value
+     */
     public String getSimple() {
         return simple;
     }
 
+    /**
+     * Gets the value of the custom.bool boolean setting.
+     *
+     * @return the custom.bool value
+     */
     public Boolean getBool() {
         return bool;
     }
 
+    /**
+     * Gets the value of the custom.validated String setting.
+     *
+     * @return the custom.validated value
+     */
     public String getValidated() {
         return validated;
     }
 
+    /**
+     * Gets the value of the custom.filtered String setting.
+     *
+     * @return the custom.filtered value
+     */
     public String getFiltered() {
         return filtered;
     }
 
+    /**
+     * Gets the value of the custom.list list of integers setting.
+     *
+     * @return the custom.list value
+     */
     public List<Integer> getList() {
         return list;
     }
diff --git a/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/ExampleCustomSettingsPlugin.java b/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/ExampleCustomSettingsPlugin.java
index aa22938c72a01..0b619102c667f 100644
--- a/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/ExampleCustomSettingsPlugin.java
+++ b/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/ExampleCustomSettingsPlugin.java
@@ -42,10 +42,19 @@
 
 import static java.util.stream.Collectors.toList;
 
+/**
+ * An example plugin that includes custom settings.
+ */
 public class ExampleCustomSettingsPlugin extends Plugin {
 
     private final ExampleCustomSettingsConfig config;
 
+    /**
+     * Instantiate this plugin with the specified settings and config path.
+     *
+     * @param settings The settings for this plugin.
+     * @param configPath The path to this plugin's configuration files.
+     */
     public ExampleCustomSettingsPlugin(final Settings settings, final Path configPath) {
         this.config = new ExampleCustomSettingsConfig(new Environment(settings, configPath));
 
@@ -53,9 +62,6 @@ public ExampleCustomSettingsPlugin(final Settings settings, final Path configPat
         assert "secret".equals(config.getFiltered());
     }
 
-    /**
-     * @return the plugin's custom settings
-     */
     @Override
     public List<Setting<?>> getSettings() {
         return Arrays.asList(
diff --git a/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/package-info.java b/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/package-info.java
new file mode 100644
index 0000000000000..5af8654201da2
--- /dev/null
+++ b/plugins/examples/custom-settings/src/main/java/org/opensearch/example/customsettings/package-info.java
@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/**
+ * Example classes demonstrating the use of custom settings in a plugin.
+ */
+package org.opensearch.example.customsettings;
diff --git a/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/CustomSignificanceHeuristicPlugin.java b/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/CustomSignificanceHeuristicPlugin.java
index 49098ae36e30f..c646592af63cb 100644
--- a/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/CustomSignificanceHeuristicPlugin.java
+++ b/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/CustomSignificanceHeuristicPlugin.java
@@ -44,6 +44,12 @@
  * Plugin declaring a custom {@link SignificanceHeuristic}.
  */
 public class CustomSignificanceHeuristicPlugin extends Plugin implements SearchPlugin {
+
+    /**
+     * Instantiate this plugin.
+     */
+    public CustomSignificanceHeuristicPlugin() {};
+
     @Override
     public List<SignificanceHeuristicSpec<?>> getSignificanceHeuristics() {
         return singletonList(new SignificanceHeuristicSpec<>(SimpleHeuristic.NAME, SimpleHeuristic::new, SimpleHeuristic.PARSER));
diff --git a/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/SimpleHeuristic.java b/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/SimpleHeuristic.java
index 8365a56bcfe4e..9458bf5b75feb 100644
--- a/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/SimpleHeuristic.java
+++ b/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/SimpleHeuristic.java
@@ -44,13 +44,25 @@
  * A simple {@linkplain SignificanceHeuristic} used an example of declaring a custom heuristic.
  */
 public class SimpleHeuristic extends SignificanceHeuristic {
+    /**
+     * The name of this NamedWriteable heuristic.
+     */
     public static final String NAME = "simple";
+
+    /**
+     * The parser with which to deserialize this object from XContent.
+     */
     public static final ObjectParser<SimpleHeuristic, Void> PARSER = new ObjectParser<>(NAME, SimpleHeuristic::new);
 
+    /**
+     * Instantiates this object.
+     */
     public SimpleHeuristic() {}
 
     /**
      * Read from a stream.
+     *
+     * @param in Input to read the value from
      */
     public SimpleHeuristic(StreamInput in) throws IOException {
         // Nothing to read
diff --git a/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/package-info.java b/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/package-info.java
new file mode 100644
index 0000000000000..20809857273c4
--- /dev/null
+++ b/plugins/examples/custom-significance-heuristic/src/main/java/org/opensearch/example/customsigheuristic/package-info.java
@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/**
+ * Example classes demonstrating the use of a custom significance heuristic.
+ */
+package org.opensearch.example.customsigheuristic;
diff --git a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggester.java b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggester.java
index da154609e5f2f..05f26a8e401e1 100644
--- a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggester.java
+++ b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggester.java
@@ -41,8 +41,16 @@
 import java.io.IOException;
 import java.util.Locale;
 
+/**
+ * A custom suggester supportiong suggestion-based search.
+ */
 public class CustomSuggester extends Suggester<CustomSuggestionContext> {
 
+    /**
+     * Instantiate this object.
+     */
+    public CustomSuggester() {}
+
     // This is a pretty dumb implementation which returns the original text + fieldName + custom config option + 12 or 123
     @Override
     public Suggest.Suggestion<? extends Suggest.Suggestion.Entry<? extends Suggest.Suggestion.Entry.Option>> innerExecute(
diff --git a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggesterPlugin.java b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggesterPlugin.java
index 5706b654ffbde..b71a90e700d21 100644
--- a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggesterPlugin.java
+++ b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggesterPlugin.java
@@ -38,7 +38,16 @@
 import java.util.Collections;
 import java.util.List;
 
+/**
+ * Plugin demonstrating custom suggestion-based search.
+ */
 public class CustomSuggesterPlugin extends Plugin implements SearchPlugin {
+
+    /**
+     * Instantiate this class.
+     */
+    public CustomSuggesterPlugin() {}
+
     @Override
     public List<SearchPlugin.SuggesterSpec<?>> getSuggesters() {
         return Collections.singletonList(
diff --git a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestion.java b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestion.java
index 50ee700c3a253..f35fde03d261f 100644
--- a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestion.java
+++ b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestion.java
@@ -46,19 +46,43 @@
 
 import static org.opensearch.common.xcontent.ConstructingObjectParser.constructorArg;
 
+/**
+ * The suggestion responses corresponding with the suggestions in the request.
+ */
 public class CustomSuggestion extends Suggest.Suggestion<CustomSuggestion.Entry> {
 
+    /**
+     * An integer representing the type of the suggestion formerly used for internal serialization over the network.
+     *
+     * This class is now serialized as a NamedWriteable and this value only remains for backwards compatibility
+     */
     public static final int TYPE = 999;
 
+    /**
+     * A meaningless value used to test that plugin suggesters can add fields to their Suggestion types.
+     */
     public static final ParseField DUMMY = new ParseField("dummy");
 
     private String dummy;
 
+    /**
+     * Instantiate this object with the specified name, size, and value for the configured field.
+     *
+     * @param name The name of the suggestion as is defined in the request.
+     * @param size The suggested term size specified in request, only used for merging shard responses.
+     * @param dummy The added custom suggestion type.
+     */
     public CustomSuggestion(String name, int size, String dummy) {
         super(name, size);
         this.dummy = dummy;
     }
 
+    /**
+     * Instantiate this object from a stream.
+     *
+     * @param in Input to read the value from
+     * @throws IOException on failure to read the value.
+     */
     public CustomSuggestion(StreamInput in) throws IOException {
         super(in);
         dummy = in.readString();
@@ -85,6 +109,8 @@ public int getWriteableType() {
      *
      * This can't be serialized to xcontent because Suggestions appear in xcontent as an array of entries, so there is no place
      * to add a custom field. But we can still use a custom field internally and use it to define a Suggestion's behavior
+     *
+     * @return the value.
      */
     public String getDummy() {
         return dummy;
@@ -95,12 +121,23 @@ protected Entry newEntry(StreamInput in) throws IOException {
         return new Entry(in);
     }
 
+    /**
+     * Instantiate a CustomSuggestion from XContent.
+     *
+     * @param parser The XContent parser to use
+     * @param name Tne name of the suggestion
+     * @return A new CustomSuggestion instance for the specified name.
+     * @throws IOException on deserialization error.
+     */
     public static CustomSuggestion fromXContent(XContentParser parser, String name) throws IOException {
         CustomSuggestion suggestion = new CustomSuggestion(name, -1, null);
         parseEntries(parser, suggestion, Entry::fromXContent);
         return suggestion;
     }
 
+    /**
+     * Represents a part from the suggest text with suggested options.
+     */
     public static class Entry extends Suggest.Suggestion.Entry<CustomSuggestion.Entry.Option> {
 
         private static final ObjectParser<Entry, Void> PARSER = new ObjectParser<>("CustomSuggestionEntryParser", true, Entry::new);
@@ -117,13 +154,30 @@ public static class Entry extends Suggest.Suggestion.Entry<CustomSuggestion.Entr
 
         private String dummy;
 
+        /**
+         * Instantiate this object.
+         */
         public Entry() {}
 
+        /**
+         * Instantiate this object from the given text, offset, length, and additional dummy field.
+         *
+         * @param text the text originating from the suggest text.
+         * @param offset the start offset for this entry in the suggest text.
+         * @param length the length for this entry in the suggest text.
+         * @param dummy the additional custom field.
+         */
         public Entry(Text text, int offset, int length, String dummy) {
             super(text, offset, length);
             this.dummy = dummy;
         }
 
+        /**
+         * Instantiate this object from a stream.
+         *
+         * @param in Input to read the value from
+         * @throws IOException on failure to read the value.
+         */
         public Entry(StreamInput in) throws IOException {
             super(in);
             dummy = in.readString();
@@ -142,6 +196,8 @@ protected Option newOption(StreamInput in) throws IOException {
 
         /*
          * the value of dummy will always be the same, so this just tests that we can merge entries with custom fields
+         *
+         * @InheritDoc
          */
         @Override
         protected void merge(Suggest.Suggestion.Entry<Option> otherEntry) {
@@ -150,6 +206,8 @@ protected void merge(Suggest.Suggestion.Entry<Option> otherEntry) {
 
         /**
          * Meaningless field used to test that plugin suggesters can add fields to their entries
+         *
+         * @return the dummy field value
          */
         public String getDummy() {
             return dummy;
@@ -162,10 +220,19 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
             return builder;
         }
 
+        /**
+         * Create a Suggestion Entry from XContent
+         *
+         * @param parser The parser to use
+         * @return the Suggestion Entry
+         */
         public static Entry fromXContent(XContentParser parser) {
             return PARSER.apply(parser, null);
         }
 
+        /**
+         * An Entry Option to use with a Suggestion.
+         */
         public static class Option extends Suggest.Suggestion.Entry.Option {
 
             private static final ConstructingObjectParser<Option, Void> PARSER = new ConstructingObjectParser<>(
@@ -187,11 +254,24 @@ public static class Option extends Suggest.Suggestion.Entry.Option {
 
             private String dummy;
 
+            /**
+             * Instantiate this object from the specified text, score, and dummy field
+             *
+             * @param text The option text.
+             * @param score The option score.
+             * @param dummy The value of the dummy field.
+             */
             public Option(Text text, float score, String dummy) {
                 super(text, score);
                 this.dummy = dummy;
             }
 
+            /**
+             * Instantiate this object from a stream.
+             *
+             * @param in Input to read the value from
+             * @throws IOException on failure to read the value.
+             */
             public Option(StreamInput in) throws IOException {
                 super(in);
                 dummy = in.readString();
@@ -226,6 +306,11 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
                 return builder;
             }
 
+            /**
+             * Instantiate an Option from XContent.
+             *
+             * @param parser The XContent parser to use
+             */
             public static Option fromXContent(XContentParser parser) {
                 return PARSER.apply(parser, null);
             }
diff --git a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestionBuilder.java b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestionBuilder.java
index a7551fca3cf24..1ebf0e4b69dc8 100644
--- a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestionBuilder.java
+++ b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestionBuilder.java
@@ -48,21 +48,39 @@
 import java.util.Map;
 import java.util.Objects;
 
+/**
+ * Defines a suggest command based on a custom suffix.
+ */
 public class CustomSuggestionBuilder extends SuggestionBuilder<CustomSuggestionBuilder> {
 
+    /**
+     * The name of this builder.
+     */
     public static final String SUGGESTION_NAME = "custom";
 
+    /**
+     * The suffix field.
+     */
     protected static final ParseField RANDOM_SUFFIX_FIELD = new ParseField("suffix");
 
     private String randomSuffix;
 
+    /**
+     * Instantiate this object with the specified field and suffix.
+     *
+     * @param randomField The field name for the suggestion.
+     * @param randomSuffix The suffix for the suggestion.
+     */
     public CustomSuggestionBuilder(String randomField, String randomSuffix) {
         super(randomField);
         this.randomSuffix = randomSuffix;
     }
 
     /**
-     * Read from a stream.
+     * Instantiate this object from a stream.
+     *
+     * @param in Input to read the value from
+     * @throws IOException on failure to read the value.
      */
     public CustomSuggestionBuilder(StreamInput in) throws IOException {
         super(in);
@@ -95,6 +113,12 @@ protected int doHashCode() {
         return Objects.hash(randomSuffix);
     }
 
+    /**
+     * Instantiate a CustomSuggestionBuilder from XContent.
+     *
+     * @param parser The XContent parser to use
+     * @throws IOException on deserialization error.
+     */
     public static CustomSuggestionBuilder fromXContent(XContentParser parser) throws IOException {
         XContentParser.Token token;
         String currentFieldName = null;
diff --git a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestionContext.java b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestionContext.java
index 55b6f1c78341b..52fd33fa6a8ec 100644
--- a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestionContext.java
+++ b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/CustomSuggestionContext.java
@@ -37,10 +37,21 @@
 
 import java.util.Map;
 
+/**
+ * The suggestion context for this custom suggestion.
+ */
 public class CustomSuggestionContext extends SuggestionSearchContext.SuggestionContext {
 
+    /**
+     * Options for this context.
+     */
     public Map<String, Object> options;
 
+    /**
+     * Instantiate this objecct from the given QueryShardContext and options.
+     * @param context the QueryShardContext
+     * @param options Options for this suggestion context.
+     */
     public CustomSuggestionContext(QueryShardContext context, Map<String, Object> options) {
         super(new CustomSuggester(), context);
         this.options = options;
diff --git a/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/package-info.java b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/package-info.java
new file mode 100644
index 0000000000000..d7efc357275f3
--- /dev/null
+++ b/plugins/examples/custom-suggester/src/main/java/org/opensearch/example/customsuggester/package-info.java
@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/**
+ * Example classes demonstrating the use of a custom suggester.
+ */
+package org.opensearch.example.customsuggester;
diff --git a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistAnnotationParser.java b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistAnnotationParser.java
index 3f876cebf6b3f..d6c3da80a3859 100644
--- a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistAnnotationParser.java
+++ b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistAnnotationParser.java
@@ -36,13 +36,17 @@
 
 import java.util.Map;
 
+/**
+ * A singleton class to parse Allowlist Annotations.
+ */
 public class ExampleAllowlistAnnotationParser implements AllowlistAnnotationParser {
 
+    /**
+     * The singleton instance of this class.
+     */
     public static final ExampleAllowlistAnnotationParser INSTANCE = new ExampleAllowlistAnnotationParser();
 
-    private ExampleAllowlistAnnotationParser() {
-
-    }
+    private ExampleAllowlistAnnotationParser() {}
 
     @Override
     public Object parse(Map<String, String> arguments) {
diff --git a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistExtension.java b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistExtension.java
index b8916bb795444..d4af0daddf2b4 100644
--- a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistExtension.java
+++ b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistExtension.java
@@ -49,6 +49,11 @@
 /** An extension of painless which adds an allowlist. */
 public class ExampleAllowlistExtension implements PainlessExtension {
 
+    /**
+     * Instantiate this class.
+     */
+    public ExampleAllowlistExtension() {}
+
     @Override
     public Map<ScriptContext<?>, List<Allowlist>> getContextAllowlists() {
         Map<String, AllowlistAnnotationParser> parsers = new HashMap<>(AllowlistAnnotationParser.BASE_ANNOTATION_PARSERS);
diff --git a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistedClass.java b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistedClass.java
index 79de22b9aba74..ca58d97377478 100644
--- a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistedClass.java
+++ b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistedClass.java
@@ -40,35 +40,67 @@
  */
 public class ExampleAllowlistedClass {
 
+    /**
+     * An example constant.
+     */
     public static final int CONSTANT = 42;
 
+    /**
+     * An example public member.
+     */
     public int publicMember;
 
     private int privateMember;
 
+    /**
+     * Construct this example class with the given public and private members.
+     *
+     * @param publicMember The value for the public member.
+     * @param privateMember The value for the private member.
+     */
     public ExampleAllowlistedClass(int publicMember, int privateMember) {
         this.publicMember = publicMember;
         this.privateMember = privateMember;
     }
 
+    /**
+     * Get the value of the private member.
+     *
+     * @return the value of the private member.
+     */
     public int getPrivateMemberAccessor() {
         return this.privateMember;
     }
 
+    /**
+     * Set the value of the private member.
+     *
+     * @param privateMember the value to set.
+     */
     public void setPrivateMemberAccessor(int privateMember) {
         this.privateMember = privateMember;
     }
 
+    /**
+     * An example static method. You may be shocked, but it does nothing.
+     */
     public static void staticMethod() {
         // electricity
     }
 
-    // example augmentation method
+    /**
+     * An example static augmentation method that takes the object to operate on as the first argument to a static method.
+     *
+     * @param x The String to be operated on.
+     * @return an integer parsed from the input.
+     */
     public static int toInt(String x) {
         return Integer.parseInt(x);
     }
 
-    // example method to attach annotations in allowlist
+    /**
+     * An example method to attach annotations in allowlist.
+     */
     public void annotate() {
         // some logic here
     }
diff --git a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistedInstance.java b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistedInstance.java
index b4af91d9f1539..0833f1f0c6659 100644
--- a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistedInstance.java
+++ b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleAllowlistedInstance.java
@@ -32,17 +32,38 @@
 
 package org.opensearch.example.painlessallowlist;
 
+/**
+ * An example of an instance to be allowlisted for use by painless scripts.
+ *
+ * Each of the members and methods below are allowlisted for use in search scripts but only from this instance.
+ */
 public class ExampleAllowlistedInstance {
     private final int value;
 
+    /**
+     * Instantiate this instance with a value.
+     *
+     * @param value A base value to set.
+     */
     public ExampleAllowlistedInstance(int value) {
         this.value = value;
     }
 
+    /**
+     * A method that can be allowlisted to add an input value to the stored base value.
+     *
+     * @param value The value to add.
+     * @return The sum of the base value and the new value. The base value remains unchanged.
+     */
     public int addValue(int value) {
         return this.value + value;
     }
 
+    /**
+     * Get the stored base value.
+     *
+     * @return The base value.
+     */
     public int getValue() {
         return value;
     }
diff --git a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExamplePainlessAnnotation.java b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExamplePainlessAnnotation.java
index 1b33f7fd49a38..428a0cc688ad3 100644
--- a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExamplePainlessAnnotation.java
+++ b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExamplePainlessAnnotation.java
@@ -32,22 +32,53 @@
 
 package org.opensearch.example.painlessallowlist;
 
+/**
+ * An example of an annotation to be allowlisted for use by painless scripts
+ *
+ * The annotation below is allowlisted for use in search scripts.
+ * See <a href="file:example_allowlist.txt">example_allowlist.txt</a>.
+ */
 public class ExamplePainlessAnnotation {
 
+    /**
+     * The annotation name.
+     */
     public static final String NAME = "example_annotation";
 
+    /**
+     * The category field of the annotation.
+     */
     public int category;
+    /**
+     * The message field of the annotation.
+     */
     public String message;
 
+    /**
+     * Create this annotation with the given category and message.
+     *
+     * @param category The category of the annotation..
+     * @param message The message for the annotation.
+     */
     public ExamplePainlessAnnotation(int category, String message) {
         this.category = category;
         this.message = message;
     }
 
+    /**
+     * Gets the category.
+     *
+     * @return the category.
+     */
     public int getCategory() {
         return category;
     }
 
+    /**
+     * Gets the message.
+     *
+     * @return the message.
+     */
     public String getMessage() {
         return message;
     }
diff --git a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleStaticMethodClass.java b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleStaticMethodClass.java
index a226ed6b08677..25443977a0f66 100644
--- a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleStaticMethodClass.java
+++ b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/ExampleStaticMethodClass.java
@@ -32,7 +32,23 @@
 
 package org.opensearch.example.painlessallowlist;
 
+/**
+ * An example of a class with static methods to be allowlisted for use by painless scripts
+ *
+ * The method below is allowlisted for use in search scripts.
+ * See <a href="file:example_allowlist.txt">example_allowlist.txt</a>.
+ */
 public class ExampleStaticMethodClass {
+
+    private ExampleStaticMethodClass() {}
+
+    /**
+     * An example static method to add integers.
+     *
+     * @param x A number to add.
+     * @param y Another number to add.
+     * @return The sum of x and y.
+     */
     public static int exampleAddInts(int x, int y) {
         return x + y;
     }
diff --git a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/MyAllowlistPlugin.java b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/MyAllowlistPlugin.java
index fdae22783cf19..baf62ed87c25c 100644
--- a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/MyAllowlistPlugin.java
+++ b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/MyAllowlistPlugin.java
@@ -34,6 +34,16 @@
 
 import org.opensearch.plugins.Plugin;
 
+/**
+ * A class extending {@link Plugin} intended as a signpost. Does nothing, since allowlists are extended through SPI.
+ * See {@link ExampleAllowlistExtension} for implementation details.
+ */
 public class MyAllowlistPlugin extends Plugin {
-    // we don't actually need anything here, since allowlists are extended through SPI
+
+    /**
+     * Instantiates this class.
+     */
+    public MyAllowlistPlugin() {}
+
+    // we don't actually need anything here,
 }
diff --git a/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/package-info.java b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/package-info.java
new file mode 100644
index 0000000000000..dfe2d00e716c1
--- /dev/null
+++ b/plugins/examples/painless-allowlist/src/main/java/org/opensearch/example/painlessallowlist/package-info.java
@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/**
+ * Example classes demonstrating addition of classes to a Painless allowlist.
+ */
+package org.opensearch.example.painlessallowlist;
diff --git a/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/ExampleRescoreBuilder.java b/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/ExampleRescoreBuilder.java
index 724f9f6743624..034531451ec8a 100644
--- a/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/ExampleRescoreBuilder.java
+++ b/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/ExampleRescoreBuilder.java
@@ -44,9 +44,9 @@
 import org.opensearch.common.xcontent.ConstructingObjectParser;
 import org.opensearch.common.xcontent.XContentBuilder;
 import org.opensearch.common.xcontent.XContentParser;
+import org.opensearch.index.fielddata.IndexFieldData;
 import org.opensearch.index.fielddata.LeafFieldData;
 import org.opensearch.index.fielddata.LeafNumericFieldData;
-import org.opensearch.index.fielddata.IndexFieldData;
 import org.opensearch.index.fielddata.SortedNumericDoubleValues;
 import org.opensearch.index.query.QueryRewriteContext;
 import org.opensearch.index.query.QueryShardContext;
@@ -67,16 +67,31 @@
  * Example rescorer that multiplies the score of the hit by some factor and doesn't resort them.
  */
 public class ExampleRescoreBuilder extends RescorerBuilder<ExampleRescoreBuilder> {
+    /**
+     * The name of this builder.
+     */
     public static final String NAME = "example";
 
     private final float factor;
     private final String factorField;
 
+    /**
+     * Instantiate this builder with a weighting factor and optional field.
+     *
+     * @param factor The weighting factor.
+     * @param factorField An optional field.
+     */
     public ExampleRescoreBuilder(float factor, @Nullable String factorField) {
         this.factor = factor;
         this.factorField = factorField;
     }
 
+    /**
+     * Instantiate this object from a stream.
+     *
+     * @param in Input to read the value from
+     * @throws IOException on failure to read the value.
+     */
     ExampleRescoreBuilder(StreamInput in) throws IOException {
         super(in);
         factor = in.readFloat();
@@ -119,6 +134,11 @@ protected void doXContent(XContentBuilder builder, Params params) throws IOExcep
         PARSER.declareString(optionalConstructorArg(), FACTOR_FIELD);
     }
 
+    /**
+     * Instantiate an ExampleRescoreBuilder from XContent.
+     *
+     * @param parser The XContent parser to use
+     */
     public static ExampleRescoreBuilder fromXContent(XContentParser parser) {
         return PARSER.apply(parser, null);
     }
diff --git a/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/ExampleRescorePlugin.java b/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/ExampleRescorePlugin.java
index 1962b24cafa3d..3cf2d57631906 100644
--- a/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/ExampleRescorePlugin.java
+++ b/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/ExampleRescorePlugin.java
@@ -39,7 +39,16 @@
 
 import static java.util.Collections.singletonList;
 
+/**
+ * Example plugin that implements custom rescore behavior.
+ */
 public class ExampleRescorePlugin extends Plugin implements SearchPlugin {
+
+    /**
+     * Instantiate this object.
+     */
+    public ExampleRescorePlugin() {}
+
     @Override
     public List<RescorerSpec<?>> getRescorers() {
         return singletonList(
diff --git a/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/package-info.java b/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/package-info.java
new file mode 100644
index 0000000000000..5810afb85f0db
--- /dev/null
+++ b/plugins/examples/rescore/src/main/java/org/opensearch/example/rescore/package-info.java
@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/**
+ * Example classes demonstrating the use of a custom rescorer in a plugin.
+ */
+package org.opensearch.example.rescore;
diff --git a/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/ExampleCatAction.java b/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/ExampleCatAction.java
index 5f3d241ff38f2..06e0cee69e68f 100644
--- a/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/ExampleCatAction.java
+++ b/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/ExampleCatAction.java
@@ -46,10 +46,15 @@
 import static org.opensearch.rest.RestRequest.Method.POST;
 
 /**
- * Example of adding a cat action with a plugin.
+ * Example of adding a cat REST action with a plugin.
  */
 public class ExampleCatAction extends AbstractCatAction {
 
+    /**
+     * Instantiate this class.
+     */
+    public ExampleCatAction() {}
+
     @Override
     public List<Route> routes() {
         return unmodifiableList(asList(new Route(GET, "/_cat/example"), new Route(POST, "/_cat/example")));
@@ -82,6 +87,11 @@ protected void documentation(StringBuilder sb) {
         sb.append(documentation());
     }
 
+    /**
+     * Documents this REST action.
+     *
+     * @return Syntax documentation.
+     */
     public static String documentation() {
         return "/_cat/example\n";
     }
diff --git a/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/ExampleRestHandlerPlugin.java b/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/ExampleRestHandlerPlugin.java
index 4a3353193aea4..ec7f4c8fdd7ae 100644
--- a/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/ExampleRestHandlerPlugin.java
+++ b/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/ExampleRestHandlerPlugin.java
@@ -48,8 +48,16 @@
 
 import static java.util.Collections.singletonList;
 
+/**
+ * A plugin demonstrating the implementation of a new Rest Handler.
+ */
 public class ExampleRestHandlerPlugin extends Plugin implements ActionPlugin {
 
+    /**
+     * Instantiate this plugin.
+     */
+    public ExampleRestHandlerPlugin() {}
+
     @Override
     public List<RestHandler> getRestHandlers(
         final Settings settings,
diff --git a/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/package-info.java b/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/package-info.java
new file mode 100644
index 0000000000000..e027d9dcb87a6
--- /dev/null
+++ b/plugins/examples/rest-handler/src/main/java/org/opensearch/example/resthandler/package-info.java
@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/**
+ * Example classes demonstrating the addition of a REST action.
+ */
+package org.opensearch.example.resthandler;
diff --git a/plugins/examples/script-expert-scoring/src/main/java/org/opensearch/example/expertscript/ExpertScriptPlugin.java b/plugins/examples/script-expert-scoring/src/main/java/org/opensearch/example/expertscript/ExpertScriptPlugin.java
index 819176e3e1cb0..e7615d9ad7204 100644
--- a/plugins/examples/script-expert-scoring/src/main/java/org/opensearch/example/expertscript/ExpertScriptPlugin.java
+++ b/plugins/examples/script-expert-scoring/src/main/java/org/opensearch/example/expertscript/ExpertScriptPlugin.java
@@ -58,6 +58,11 @@
  */
 public class ExpertScriptPlugin extends Plugin implements ScriptPlugin {
 
+    /**
+     * Instantiate this plugin.
+     */
+    public ExpertScriptPlugin() {}
+
     @Override
     public ScriptEngine getScriptEngine(Settings settings, Collection<ScriptContext<?>> contexts) {
         return new MyExpertScriptEngine();
diff --git a/plugins/examples/script-expert-scoring/src/main/java/org/opensearch/example/expertscript/package-info.java b/plugins/examples/script-expert-scoring/src/main/java/org/opensearch/example/expertscript/package-info.java
new file mode 100644
index 0000000000000..31d7e9e0a1dfa
--- /dev/null
+++ b/plugins/examples/script-expert-scoring/src/main/java/org/opensearch/example/expertscript/package-info.java
@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/**
+ * Example classes demonstrating expert scoring.
+ */
+package org.opensearch.example.expertscript;