Deprecate types in create index requests. (#37134)

From #29453 and #37285, the include_type_name parameter was already present and defaulted to false. This PR makes the following updates:
* Add deprecation warnings to RestCreateIndexAction, plus tests in RestCreateIndexActionTests.
* Add a typeless 'create index' method to the Java HLRC, and deprecate the old typed version. To do this cleanly, I created new CreateIndexRequest and CreateIndexResponse objects that differ from the existing server ones.

Author: jtibshirani

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

@@ -27,8 +27,6 @@
 import org.elasticsearch.action.admin.indices.cache.clear.ClearIndicesCacheRequest;
 import org.elasticsearch.action.admin.indices.cache.clear.ClearIndicesCacheResponse;
 import org.elasticsearch.action.admin.indices.close.CloseIndexRequest;
-import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
-import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
 import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
 import org.elasticsearch.action.admin.indices.flush.FlushRequest;
 import org.elasticsearch.action.admin.indices.flush.FlushResponse;
@@ -59,6 +57,8 @@
 import org.elasticsearch.action.admin.indices.validate.query.ValidateQueryResponse;
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
 import org.elasticsearch.client.core.ShardsAcknowledgedResponse;
+import org.elasticsearch.client.indices.CreateIndexRequest;
+import org.elasticsearch.client.indices.CreateIndexResponse;
 import org.elasticsearch.client.indices.FreezeIndexRequest;
 import org.elasticsearch.client.indices.GetIndexTemplatesRequest;
 import org.elasticsearch.client.indices.IndexTemplatesExistRequest;
@@ -120,9 +120,10 @@ public void deleteAsync(DeleteIndexRequest deleteIndexRequest, RequestOptions op
      * @return the response
      * @throws IOException in case there is a problem sending the request or parsing back the response
      */
-    public CreateIndexResponse create(CreateIndexRequest createIndexRequest, RequestOptions options) throws IOException {
+    public CreateIndexResponse create(CreateIndexRequest createIndexRequest,
+                                      RequestOptions options) throws IOException {
         return restHighLevelClient.performRequestAndParseEntity(createIndexRequest, IndicesRequestConverters::createIndex, options,
-                CreateIndexResponse::fromXContent, emptySet());
+            CreateIndexResponse::fromXContent, emptySet());
     }
 
     /**
@@ -133,9 +134,54 @@ public CreateIndexResponse create(CreateIndexRequest createIndexRequest, 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
      */
-    public void createAsync(CreateIndexRequest createIndexRequest, RequestOptions options, ActionListener<CreateIndexResponse> listener) {
+    public void createAsync(CreateIndexRequest createIndexRequest,
+                            RequestOptions options,
+                            ActionListener<CreateIndexResponse> listener) {
         restHighLevelClient.performRequestAsyncAndParseEntity(createIndexRequest, IndicesRequestConverters::createIndex, options,
-                CreateIndexResponse::fromXContent, listener, emptySet());
+            CreateIndexResponse::fromXContent, listener, emptySet());
+    }
+
+    /**
+     * Creates an index using the Create Index API.
+     * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-create-index.html">
+     * Create Index API on elastic.co</a>
+     * @param createIndexRequest the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @return the response
+     * @throws IOException in case there is a problem sending the request or parsing back the response
+     *
+     * @deprecated This method uses an old request object which still refers to types, a deprecated feature. The
+     * method {@link #create(CreateIndexRequest, RequestOptions)} should be used instead, which accepts a new
+     * request object.
+     */
+    @Deprecated
+    public org.elasticsearch.action.admin.indices.create.CreateIndexResponse create(
+            org.elasticsearch.action.admin.indices.create.CreateIndexRequest createIndexRequest,
+            RequestOptions options) throws IOException {
+        return restHighLevelClient.performRequestAndParseEntity(createIndexRequest,
+            IndicesRequestConverters::createIndex, options,
+            org.elasticsearch.action.admin.indices.create.CreateIndexResponse::fromXContent, emptySet());
+    }
+
+    /**
+     * Asynchronously creates an index using the Create Index API.
+     * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-create-index.html">
+     * Create Index API on elastic.co</a>
+     * @param createIndexRequest 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
+     *
+     * @deprecated This method uses an old request object which still refers to types, a deprecated feature. The
+     * method {@link #createAsync(CreateIndexRequest, RequestOptions, ActionListener)} should be used instead,
+     * which accepts a new request object.
+     */
+    @Deprecated
+    public void createAsync(org.elasticsearch.action.admin.indices.create.CreateIndexRequest createIndexRequest,
+                            RequestOptions options,
+                            ActionListener<org.elasticsearch.action.admin.indices.create.CreateIndexResponse> listener) {
+        restHighLevelClient.performRequestAsyncAndParseEntity(createIndexRequest,
+            IndicesRequestConverters::createIndex, options,
+            org.elasticsearch.action.admin.indices.create.CreateIndexResponse::fromXContent, listener, emptySet());
     }
 
     /**

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

@@ -29,7 +29,6 @@
 import org.elasticsearch.action.admin.indices.analyze.AnalyzeRequest;
 import org.elasticsearch.action.admin.indices.cache.clear.ClearIndicesCacheRequest;
 import org.elasticsearch.action.admin.indices.close.CloseIndexRequest;
-import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
 import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
 import org.elasticsearch.action.admin.indices.flush.FlushRequest;
 import org.elasticsearch.action.admin.indices.flush.SyncedFlushRequest;
@@ -47,6 +46,7 @@
 import org.elasticsearch.action.admin.indices.template.delete.DeleteIndexTemplateRequest;
 import org.elasticsearch.action.admin.indices.template.put.PutIndexTemplateRequest;
 import org.elasticsearch.action.admin.indices.validate.query.ValidateQueryRequest;
+import org.elasticsearch.client.indices.CreateIndexRequest;
 import org.elasticsearch.client.indices.FreezeIndexRequest;
 import org.elasticsearch.client.indices.GetIndexTemplatesRequest;
 import org.elasticsearch.client.indices.IndexTemplatesExistRequest;
@@ -98,6 +98,21 @@ static Request closeIndex(CloseIndexRequest closeIndexRequest) {
     }
 
     static Request createIndex(CreateIndexRequest createIndexRequest) throws IOException {
+        String endpoint = new RequestConverters.EndpointBuilder()
+            .addPathPart(createIndexRequest.index()).build();
+        Request request = new Request(HttpPut.METHOD_NAME, endpoint);
+
+        RequestConverters.Params parameters = new RequestConverters.Params(request);
+        parameters.withTimeout(createIndexRequest.timeout());
+        parameters.withMasterTimeout(createIndexRequest.masterNodeTimeout());
+        parameters.withWaitForActiveShards(createIndexRequest.waitForActiveShards());
+
+        request.setEntity(RequestConverters.createEntity(createIndexRequest, RequestConverters.REQUEST_BODY_CONTENT_TYPE));
+        return request;
+    }
+
+    static Request createIndex(org.elasticsearch.action.admin.indices.create.CreateIndexRequest createIndexRequest)
+            throws IOException {
         String endpoint = RequestConverters.endpoint(createIndexRequest.indices());
         Request request = new Request(HttpPut.METHOD_NAME, endpoint);