Add delete alias to the HLRC (elastic#48819)

The delete alias call is a rest only API call, but should still be added
to the rest client. This commit adds it as well as relevant tests.

Ref elastic#47678

client/rest-high-level/src/main/java/org/elasticsearch/client/IndicesClient.java

@@ -50,6 +50,7 @@
 import org.elasticsearch.client.indices.CloseIndexResponse;
 import org.elasticsearch.client.indices.CreateIndexRequest;
 import org.elasticsearch.client.indices.CreateIndexResponse;
+import org.elasticsearch.client.indices.DeleteAliasRequest;
 import org.elasticsearch.client.indices.FreezeIndexRequest;
 import org.elasticsearch.client.indices.GetFieldMappingsRequest;
 import org.elasticsearch.client.indices.GetFieldMappingsResponse;
@@ -1062,4 +1063,28 @@ public Cancellable reloadAnalyzersAsync(ReloadAnalyzersRequest request, RequestO
         return restHighLevelClient.performRequestAsyncAndParseEntity(request, IndicesRequestConverters::reloadAnalyzers, options,
                 ReloadAnalyzersResponse::fromXContent, listener, emptySet());
     }
+
+    /**
+     * Synchronously calls the delete alias api
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     */
+    public org.elasticsearch.client.core.AcknowledgedResponse deleteAlias(DeleteAliasRequest request,
+                                                                          RequestOptions options) throws IOException {
+        return restHighLevelClient.performRequestAndParseEntity(request, IndicesRequestConverters::deleteAlias, options,
+            org.elasticsearch.client.core.AcknowledgedResponse::fromXContent, emptySet());
+    }
+
+    /**
+     * Asynchronously calls the delete alias api
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @param listener the listener to be notified upon request completion
+     * @return cancellable that may be used to cancel the request
+     */
+    public Cancellable deleteAliasAsync(DeleteAliasRequest request, RequestOptions options,
+                                                ActionListener<org.elasticsearch.client.core.AcknowledgedResponse> listener) {
+        return restHighLevelClient.performRequestAsyncAndParseEntity(request, IndicesRequestConverters::deleteAlias, options,
+            org.elasticsearch.client.core.AcknowledgedResponse::fromXContent, listener, emptySet());
+    }
 }

client/rest-high-level/src/main/java/org/elasticsearch/client/IndicesRequestConverters.java

@@ -42,6 +42,7 @@
 import org.elasticsearch.client.indices.AnalyzeRequest;
 import org.elasticsearch.client.indices.CloseIndexRequest;
 import org.elasticsearch.client.indices.CreateIndexRequest;
+import org.elasticsearch.client.indices.DeleteAliasRequest;
 import org.elasticsearch.client.indices.FreezeIndexRequest;
 import org.elasticsearch.client.indices.GetFieldMappingsRequest;
 import org.elasticsearch.client.indices.GetIndexRequest;
@@ -483,4 +484,17 @@ static Request reloadAnalyzers(ReloadAnalyzersRequest reloadAnalyzersRequest) {
         request.addParameters(parameters.asMap());
         return request;
     }
+
+    static Request deleteAlias(DeleteAliasRequest deleteAliasRequest) {
+        String endpoint = new RequestConverters.EndpointBuilder()
+            .addPathPart(deleteAliasRequest.getIndex())
+            .addPathPartAsIs("_alias")
+            .addPathPart(deleteAliasRequest.getAlias()).build();
+        Request request = new Request(HttpDelete.METHOD_NAME, endpoint);
+        RequestConverters.Params parameters = new RequestConverters.Params();
+        parameters.withTimeout(deleteAliasRequest.timeout());
+        parameters.withMasterTimeout(deleteAliasRequest.masterNodeTimeout());
+        request.addParameters(parameters.asMap());
+        return request;
+    }
 }

client/rest-high-level/src/main/java/org/elasticsearch/client/indices/DeleteAliasRequest.java

@@ -0,0 +1,41 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.indices;
+
+import org.elasticsearch.client.TimedRequest;
+
+public class DeleteAliasRequest extends TimedRequest {
+
+    private final String index;
+    private final String alias;
+
+    public DeleteAliasRequest(String index, String alias) {
+        this.index = index;
+        this.alias = alias;
+    }
+
+    public String getIndex() {
+        return index;
+    }
+
+    public String getAlias() {
+        return alias;
+    }
+}

client/rest-high-level/src/test/java/org/elasticsearch/client/IndicesClientIT.java

@@ -61,6 +61,7 @@
 import org.elasticsearch.client.indices.CloseIndexResponse;
 import org.elasticsearch.client.indices.CreateIndexRequest;
 import org.elasticsearch.client.indices.CreateIndexResponse;
+import org.elasticsearch.client.indices.DeleteAliasRequest;
 import org.elasticsearch.client.indices.FreezeIndexRequest;
 import org.elasticsearch.client.indices.GetFieldMappingsRequest;
 import org.elasticsearch.client.indices.GetFieldMappingsResponse;
@@ -1550,4 +1551,32 @@ public void testReloadAnalyzer() throws IOException {
         assertNotNull(reloadResponse.shards());
         assertTrue(reloadResponse.getReloadedDetails().containsKey("test"));
     }
+
+    public void testDeleteAlias() throws IOException {
+        String index = "test";
+        createIndex(index, Settings.EMPTY);
+
+        String alias = "alias";
+        String alias2 = "alias2";
+        IndicesAliasesRequest aliasesAddRemoveRequest = new IndicesAliasesRequest();
+        aliasesAddRemoveRequest.addAliasAction(new AliasActions(AliasActions.Type.ADD).indices(index).alias(alias));
+        aliasesAddRemoveRequest.addAliasAction(new AliasActions(AliasActions.Type.ADD).indices(index).alias(alias + "2"));
+        AcknowledgedResponse aliasResponse = execute(aliasesAddRemoveRequest, highLevelClient().indices()::updateAliases,
+            highLevelClient().indices()::updateAliasesAsync);
+        assertTrue(aliasResponse.isAcknowledged());
+        assertThat(aliasExists(alias), equalTo(true));
+        assertThat(aliasExists(alias2), equalTo(true));
+        assertThat(aliasExists(index, alias), equalTo(true));
+        assertThat(aliasExists(index, alias2), equalTo(true));
+
+        DeleteAliasRequest request = new DeleteAliasRequest(index, alias);
+        org.elasticsearch.client.core.AcknowledgedResponse aliasDeleteResponse = execute(request,
+            highLevelClient().indices()::deleteAlias,
+            highLevelClient().indices()::deleteAliasAsync);
+
+        assertThat(aliasExists(alias), equalTo(false));
+        assertThat(aliasExists(alias2), equalTo(true));
+        assertThat(aliasExists(index, alias), equalTo(false));
+        assertThat(aliasExists(index, alias2), equalTo(true));
+    }
 }

client/rest-high-level/src/test/java/org/elasticsearch/client/IndicesRequestConvertersTests.java

@@ -46,6 +46,7 @@
 import org.elasticsearch.client.indices.AnalyzeRequest;
 import org.elasticsearch.client.indices.CloseIndexRequest;
 import org.elasticsearch.client.indices.CreateIndexRequest;
+import org.elasticsearch.client.indices.DeleteAliasRequest;
 import org.elasticsearch.client.indices.GetFieldMappingsRequest;
 import org.elasticsearch.client.indices.GetIndexRequest;
 import org.elasticsearch.client.indices.GetIndexTemplatesRequest;
@@ -934,4 +935,18 @@ public void testReloadAnalyzers() {
         Assert.assertThat(request.getParameters(), equalTo(expectedParams));
         Assert.assertThat(request.getEntity(), nullValue());
     }
+
+    public void testDeleteAlias() {
+        DeleteAliasRequest deleteAliasRequest = new DeleteAliasRequest(randomAlphaOfLength(4), randomAlphaOfLength(4));
+
+        Map<String, String> expectedParams = new HashMap<>();
+        RequestConvertersTests.setRandomMasterTimeout(deleteAliasRequest, expectedParams);
+        RequestConvertersTests.setRandomTimeout(deleteAliasRequest, AcknowledgedRequest.DEFAULT_ACK_TIMEOUT, expectedParams);
+
+        Request request = IndicesRequestConverters.deleteAlias(deleteAliasRequest);
+        Assert.assertThat(request.getMethod(), equalTo(HttpDelete.METHOD_NAME));
+        Assert.assertThat(request.getEndpoint(), equalTo("/" + deleteAliasRequest.getIndex() + "/_alias/" + deleteAliasRequest.getAlias()));
+        Assert.assertThat(request.getParameters(), equalTo(expectedParams));
+        Assert.assertThat(request.getEntity(), nullValue());
+    }
 }

client/rest-high-level/src/test/java/org/elasticsearch/client/RestHighLevelClientTests.java

@@ -763,7 +763,6 @@ public void testApiNamingConventions() throws Exception {
             "create",
             "get_script_context",
             "get_source",
-            "indices.delete_alias",
             "indices.exists_type",
             "indices.get_upgrade",
             "indices.put_alias",

client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/IndicesClientDocumentationIT.java

@@ -65,6 +65,7 @@
 import org.elasticsearch.client.indices.CloseIndexResponse;
 import org.elasticsearch.client.indices.CreateIndexRequest;
 import org.elasticsearch.client.indices.CreateIndexResponse;
+import org.elasticsearch.client.indices.DeleteAliasRequest;
 import org.elasticsearch.client.indices.DetailAnalyzeResponse;
 import org.elasticsearch.client.indices.FreezeIndexRequest;
 import org.elasticsearch.client.indices.GetFieldMappingsRequest;
@@ -2880,4 +2881,87 @@ public void onFailure(Exception e) {
             // end::reload-analyzers-notfound
         }
     }
+
+    @SuppressWarnings("unused")
+    public void testDeleteAlias() throws Exception {
+        RestHighLevelClient client = highLevelClient();
+
+        {
+            CreateIndexResponse createIndexResponse = client.indices().create(new CreateIndexRequest("index1"), RequestOptions.DEFAULT);
+            assertTrue(createIndexResponse.isAcknowledged());
+        }
+        {
+            IndicesAliasesRequest request = new IndicesAliasesRequest();
+            AliasActions aliasAction =
+                new AliasActions(AliasActions.Type.ADD)
+                    .index("index1")
+                    .alias("alias1");
+            request.addAliasAction(aliasAction);
+            AcknowledgedResponse indicesAliasesResponse =
+                client.indices().updateAliases(request, RequestOptions.DEFAULT);
+            assertTrue(indicesAliasesResponse.isAcknowledged());
+        }
+        {
+            IndicesAliasesRequest request = new IndicesAliasesRequest();
+            AliasActions aliasAction =
+                new AliasActions(AliasActions.Type.ADD)
+                    .index("index1")
+                    .alias("alias2");
+            request.addAliasAction(aliasAction);
+            AcknowledgedResponse indicesAliasesResponse =
+                client.indices().updateAliases(request, RequestOptions.DEFAULT);
+            assertTrue(indicesAliasesResponse.isAcknowledged());
+        }
+        {
+            // tag::delete-alias-request
+            DeleteAliasRequest request = new DeleteAliasRequest("index1", "alias1");
+            // end::delete-alias-request
+
+            // tag::delete-alias-request-timeout
+            request.setTimeout(TimeValue.timeValueMinutes(2)); // <1>
+            // end::delete-alias-request-timeout
+            // tag::delete-alias-request-masterTimeout
+            request.setMasterTimeout(TimeValue.timeValueMinutes(1)); // <1>
+            // end::delete-alias-request-masterTimeout
+
+            // tag::delete-alias-execute
+            org.elasticsearch.client.core.AcknowledgedResponse deleteAliasResponse =
+                client.indices().deleteAlias(request, RequestOptions.DEFAULT);
+            // end::delete-alias-execute
+
+            // tag::delete-alias-response
+            boolean acknowledged = deleteAliasResponse.isAcknowledged(); // <1>
+            // end::delete-alias-response
+            assertTrue(acknowledged);
+        }
+
+        {
+            DeleteAliasRequest request = new DeleteAliasRequest("index1", "alias2"); // <1>
+
+            // tag::delete-alias-execute-listener
+            ActionListener<org.elasticsearch.client.core.AcknowledgedResponse> listener =
+                new ActionListener<org.elasticsearch.client.core.AcknowledgedResponse>() {
+                    @Override
+                    public void onResponse(org.elasticsearch.client.core.AcknowledgedResponse deleteAliasResponse) {
+                        // <1>
+                    }
+
+                    @Override
+                    public void onFailure(Exception e) {
+                        // <2>
+                    }
+                };
+            // end::delete-alias-execute-listener
+
+            // Replace the empty listener by a blocking listener in test
+            final CountDownLatch latch = new CountDownLatch(1);
+            listener = new LatchedActionListener<>(listener, latch);
+
+            // tag::delete-alias-execute-async
+            client.indices().deleteAliasAsync(request, RequestOptions.DEFAULT, listener); // <1>
+            // end::delete-alias-execute-async
+
+            assertTrue(latch.await(30L, TimeUnit.SECONDS));
+        }
+    }
 }

docs/java-rest/high-level/indices/delete_alias.asciidoc

@@ -0,0 +1,49 @@
+--
+:api: delete-alias
+:request: DeleteAliasRequest
+:response: AcknowledgedResponse
+--
+
+[id="{upid}-{api}"]
+=== Delete Alias API
+
+[id="{upid}-{api}-request"]
+==== Delete Alias Request
+
+An +{request}+ requires an `index` and an `alias` argument:
+
+["source","java",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{doc-tests-file}[{api}-request]
+--------------------------------------------------
+
+==== Optional arguments
+The following arguments can optionally be provided:
+
+["source","java",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{doc-tests-file}[{api}-request-timeout]
+--------------------------------------------------
+<1> Timeout to wait for the all the nodes to acknowledge the index is opened
+as a `TimeValue`
+
+["source","java",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{doc-tests-file}[{api}-request-masterTimeout]
+--------------------------------------------------
+<1> Timeout to connect to the master node as a `TimeValue`
+
+[id="{upid}-{api}-response"]
+==== Delete Alias Response
+
+The returned +{response}+ indicates if the request to delete the alias
+was received.
+
+["source","java",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{doc-tests-file}[{api}-response]
+--------------------------------------------------
+<1> Whether or not the request to delete the alias was
+acknowledged.
+
+include::../execution.asciidoc[]

docs/java-rest/high-level/supported-apis.asciidoc

@@ -120,6 +120,7 @@ Alias Management::
 * <<{upid}-update-aliases>>
 * <<{upid}-exists-alias>>
 * <<{upid}-get-alias>>
+* <<{upid}-delete-alias>>
 
 Template Management::
 * <<{upid}-get-templates>>
@@ -145,6 +146,7 @@ include::indices/put_mapping.asciidoc[]
 include::indices/get_mappings.asciidoc[]
 include::indices/get_field_mappings.asciidoc[]
 include::indices/update_aliases.asciidoc[]
+include::indices/delete_alias.asciidoc[]
 include::indices/exists_alias.asciidoc[]
 include::indices/get_alias.asciidoc[]
 include::indices/put_settings.asciidoc[]