Remove data stream feature flag (#59572)

so that it can used in the next minor release (7.9.0).

Backport of #59504 to 7.x branch.
Closes #53100

build.gradle

@@ -484,17 +484,6 @@ allprojects {
   }
 }
 
-// TODO: remove this once 7.7 is released and the 7.x branch is 7.8
-subprojects {
-  pluginManager.withPlugin('elasticsearch.testclusters') {
-    testClusters.all {
-      if (org.elasticsearch.gradle.info.BuildParams.isSnapshotBuild() == false) {
-        systemProperty 'es.datastreams_feature_enabled', 'true'
-      }
-    }
-  }
-}
-
 subprojects {
   project.ext.disableTasks = { String... tasknames ->
     for (String taskname : tasknames) {

server/build.gradle

@@ -122,7 +122,7 @@ dependencies {
 
   // repackaged jna with native bits linked against all elastic supported platforms
   api "org.elasticsearch:jna:${versions.jna}"
-  
+
   testImplementation(project(":test:framework")) {
     // tests use the locally compiled version of server
     exclude group: 'org.elasticsearch', module: 'server'
@@ -333,12 +333,6 @@ licenseHeaders {
   excludes << 'org/elasticsearch/common/inject/**/*'
 }
 
-tasks.named('internalClusterTest').configure {
-  if (org.elasticsearch.gradle.info.BuildParams.isSnapshotBuild() == false) {
-    systemProperty 'es.datastreams_feature_enabled', 'true'
-  }
-}
-
 licenseHeaders {
   excludes << 'org/elasticsearch/client/documentation/placeholder.txt'
 }

server/src/main/java/org/elasticsearch/action/ActionModule.java

@@ -21,7 +21,6 @@
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.elasticsearch.Build;
 import org.elasticsearch.action.admin.cluster.allocation.ClusterAllocationExplainAction;
 import org.elasticsearch.action.admin.cluster.allocation.TransportClusterAllocationExplainAction;
 import org.elasticsearch.action.admin.cluster.configuration.AddVotingConfigExclusionsAction;
@@ -416,21 +415,6 @@ public class ActionModule extends AbstractModule {
     private static final Logger logger = LogManager.getLogger(ActionModule.class);
 
     private final boolean transportClient;
-    public static final boolean DATASTREAMS_FEATURE_ENABLED;
-
-    static {
-        final String property = System.getProperty("es.datastreams_feature_enabled");
-        if (Build.CURRENT.isSnapshot() || "true".equals(property)) {
-            DATASTREAMS_FEATURE_ENABLED = true;
-        } else if ("false".equals(property) || property == null) {
-            DATASTREAMS_FEATURE_ENABLED = false;
-        } else {
-            throw new IllegalArgumentException(
-                "expected es.datastreams_feature_enabled to be unset or [true|false] but was [" + property + "]"
-            );
-        }
-    }
-
     private final Settings settings;
     private final IndexNameExpressionResolver indexNameExpressionResolver;
     private final IndexScopedSettings indexScopedSettings;
@@ -627,13 +611,11 @@ public <Request extends ActionRequest, Response extends ActionResponse> void reg
         actionPlugins.stream().flatMap(p -> p.getActions().stream()).forEach(actions::register);
 
         // Data streams:
-        if (DATASTREAMS_FEATURE_ENABLED) {
-            actions.register(CreateDataStreamAction.INSTANCE, CreateDataStreamAction.TransportAction.class);
-            actions.register(DeleteDataStreamAction.INSTANCE, DeleteDataStreamAction.TransportAction.class);
-            actions.register(GetDataStreamAction.INSTANCE, GetDataStreamAction.TransportAction.class);
-            actions.register(ResolveIndexAction.INSTANCE, ResolveIndexAction.TransportAction.class);
-            actions.register(DataStreamsStatsAction.INSTANCE, DataStreamsStatsAction.TransportAction.class);
-        }
+        actions.register(CreateDataStreamAction.INSTANCE, CreateDataStreamAction.TransportAction.class);
+        actions.register(DeleteDataStreamAction.INSTANCE, DeleteDataStreamAction.TransportAction.class);
+        actions.register(GetDataStreamAction.INSTANCE, GetDataStreamAction.TransportAction.class);
+        actions.register(ResolveIndexAction.INSTANCE, ResolveIndexAction.TransportAction.class);
+        actions.register(DataStreamsStatsAction.INSTANCE, DataStreamsStatsAction.TransportAction.class);
 
         // Persistent tasks:
         actions.register(StartPersistentTaskAction.INSTANCE, StartPersistentTaskAction.TransportAction.class);
@@ -793,13 +775,11 @@ public void initRestHandlers(Supplier<DiscoveryNodes> nodesInCluster) {
         registerHandler.accept(new RestDeleteDanglingIndexAction());
 
         // Data Stream API
-        if (DATASTREAMS_FEATURE_ENABLED) {
-            registerHandler.accept(new RestCreateDataStreamAction());
-            registerHandler.accept(new RestDeleteDataStreamAction());
-            registerHandler.accept(new RestGetDataStreamsAction());
-            registerHandler.accept(new RestResolveIndexAction());
-            registerHandler.accept(new RestDataStreamsStatsAction());
-        }
+        registerHandler.accept(new RestCreateDataStreamAction());
+        registerHandler.accept(new RestDeleteDataStreamAction());
+        registerHandler.accept(new RestGetDataStreamsAction());
+        registerHandler.accept(new RestResolveIndexAction());
+        registerHandler.accept(new RestDataStreamsStatsAction());
 
         // CAT API
         registerHandler.accept(new RestAllocationAction());

test/framework/src/main/java/org/elasticsearch/test/TestCluster.java

@@ -23,7 +23,6 @@
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.elasticsearch.action.ActionModule;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
 import org.elasticsearch.action.admin.indices.datastream.DeleteDataStreamAction;
 import org.elasticsearch.action.admin.indices.template.get.GetIndexTemplatesResponse;
@@ -141,7 +140,7 @@ public void assertAfterTest() throws IOException {
      */
     public void wipeAllDataStreams() {
         // Feature flag may not be enabled in all gradle modules that use ESIntegTestCase
-        if (size() > 0 && ActionModule.DATASTREAMS_FEATURE_ENABLED) {
+        if (size() > 0) {
             AcknowledgedResponse response =
                 client().admin().indices().deleteDataStream(new DeleteDataStreamAction.Request(new String[]{"*"})).actionGet();
             assertAcked(response);

x-pack/plugin/data-streams/build.gradle

@@ -1,5 +1,3 @@
-import org.elasticsearch.gradle.info.BuildParams
-
 evaluationDependsOn(xpackModule('core'))
 
 apply plugin: 'elasticsearch.esplugin'
@@ -13,17 +11,6 @@ esplugin {
 archivesBaseName = 'x-pack-data-streams'
 integTest.enabled = false
 
-tasks.named('internalClusterTest').configure {
-  if (BuildParams.isSnapshotBuild() == false) {
-    systemProperty 'es.datastreams_feature_enabled', 'true'
-  }
-}
-tasks.named('test').configure {
-  if (org.elasticsearch.gradle.info.BuildParams.isSnapshotBuild() == false) {
-    systemProperty 'es.datastreams_feature_enabled', 'true'
-  }
-}
-
 dependencies {
   compileOnly project(path: xpackModule('core'), configuration: 'default')
   testImplementation project(path: xpackModule('core'), configuration: 'testArtifacts')

x-pack/plugin/data-streams/src/main/java/org/elasticsearch/xpack/datastreams/DataStreamsPlugin.java

@@ -21,8 +21,6 @@
 import java.util.List;
 import java.util.Map;
 
-import static org.elasticsearch.action.ActionModule.DATASTREAMS_FEATURE_ENABLED;
-
 public class DataStreamsPlugin extends Plugin implements ActionPlugin, MapperPlugin {
 
     private final boolean transportClientMode;
@@ -33,11 +31,7 @@ public DataStreamsPlugin(Settings settings) {
 
     @Override
     public Map<String, MetadataFieldMapper.TypeParser> getMetadataMappers() {
-        if (DATASTREAMS_FEATURE_ENABLED) {
-            return Collections.singletonMap(DataStreamTimestampFieldMapper.NAME, new DataStreamTimestampFieldMapper.TypeParser());
-        } else {
-            return Collections.emptyMap();
-        }
+        return Collections.singletonMap(DataStreamTimestampFieldMapper.NAME, new DataStreamTimestampFieldMapper.TypeParser());
     }
 
     public Collection<Module> createGuiceModules() {

x-pack/plugin/ml/qa/native-multi-node-tests/src/test/java/org/elasticsearch/xpack/ml/integration/ClassificationIT.java

@@ -8,7 +8,6 @@
 import org.apache.logging.log4j.message.ParameterizedMessage;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.ElasticsearchStatusException;
-import org.elasticsearch.action.ActionModule;
 import org.elasticsearch.action.DocWriteRequest;
 import org.elasticsearch.action.admin.indices.refresh.RefreshRequest;
 import org.elasticsearch.action.bulk.BulkRequestBuilder;
@@ -147,7 +146,6 @@ public void testSingleNumericFeatureAndMixedTrainingAndNonTrainingRows() throws
     }
 
     public void testWithDatastreams() throws Exception {
-        assumeTrue("should only run if data streams are enabled", ActionModule.DATASTREAMS_FEATURE_ENABLED);
         initialize("classification_with_datastreams", true);
         String predictedClassField = KEYWORD_FIELD + "_prediction";
         indexData(sourceIndex, 300, 50, KEYWORD_FIELD);

x-pack/plugin/ml/qa/native-multi-node-tests/src/test/java/org/elasticsearch/xpack/ml/integration/DatafeedJobsIT.java

@@ -7,7 +7,6 @@
 
 import org.elasticsearch.ResourceNotFoundException;
 import org.elasticsearch.Version;
-import org.elasticsearch.action.ActionModule;
 import org.elasticsearch.action.admin.cluster.node.hotthreads.NodeHotThreads;
 import org.elasticsearch.action.admin.cluster.node.hotthreads.NodesHotThreadsResponse;
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
@@ -103,7 +102,6 @@ public void testLookbackOnly() throws Exception {
     }
 
     public void testLookbackOnlyDataStream() throws Exception {
-        assumeTrue("should only run if data streams are enabled", ActionModule.DATASTREAMS_FEATURE_ENABLED);
         String mapping = "{\n" +
             "      \"properties\": {\n" +
             "        \"time\": {\n" +

x-pack/plugin/ml/qa/native-multi-node-tests/src/test/java/org/elasticsearch/xpack/ml/integration/RegressionIT.java

@@ -6,7 +6,6 @@
 package org.elasticsearch.xpack.ml.integration;
 
 import org.elasticsearch.ElasticsearchException;
-import org.elasticsearch.action.ActionModule;
 import org.elasticsearch.action.DocWriteRequest;
 import org.elasticsearch.action.bulk.BulkRequestBuilder;
 import org.elasticsearch.action.bulk.BulkResponse;
@@ -399,7 +398,6 @@ public void testDependentVariableIsLong() throws Exception {
     }
 
     public void testWithDatastream() throws Exception {
-        assumeTrue("should only run if data streams are enabled", ActionModule.DATASTREAMS_FEATURE_ENABLED);
         initialize("regression_with_datastream");
         String predictedClassField = DEPENDENT_VARIABLE_FIELD + "_prediction";
         indexData(sourceIndex, 300, 50, true);

x-pack/plugin/transform/qa/single-node-tests/src/test/java/org/elasticsearch/xpack/transform/integration/TransformPivotRestIT.java

@@ -8,7 +8,6 @@
 
 import org.apache.http.entity.ContentType;
 import org.apache.http.entity.StringEntity;
-import org.elasticsearch.action.ActionModule;
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.ResponseException;
 import org.elasticsearch.common.Strings;
@@ -97,7 +96,6 @@ public void testSimplePivot() throws Exception {
     }
 
     public void testSimpleDataStreamPivot() throws Exception {
-        assumeTrue("should only run if data streams are enabled", ActionModule.DATASTREAMS_FEATURE_ENABLED);
         String indexName = "reviews_data_stream";
         createReviewsIndex(indexName,  1000, "date", true);
         String transformId = "simple_data_stream_pivot";