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 * 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.rest.action.admin.indices;

import org.elasticsearch.action.admin.indices.settings.get.GetSettingsRequest;
import org.elasticsearch.action.admin.indices.settings.get.GetSettingsResponse;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.BytesRestResponse;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.action.RestBuilderListener;

import java.io.IOException;

import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestStatus.OK;

public class RestGetSettingsAction extends BaseRestHandler {

    public RestGetSettingsAction(Settings settings, RestController controller) {
        super(settings);
        controller.registerHandler(GET, "/_settings", this);
        controller.registerHandler(GET, "/_settings/{name}", this);
        controller.registerHandler(GET, "/{index}/_settings", this);
        controller.registerHandler(GET, "/{index}/_settings/{name}", this);
        controller.registerHandler(GET, "/{index}/_setting/{name}", this);
    }

    @Override
    public String getName() {
        return "get_settings_action";
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        final String[] names = request.paramAsStringArrayOrEmptyIfAll("name");
        final boolean renderDefaults = request.paramAsBoolean("include_defaults", false);
        // This is required so the "flat_settings" parameter counts as consumed
        request.paramAsBoolean("flat_settings", false);
        GetSettingsRequest getSettingsRequest = new GetSettingsRequest()
                .indices(Strings.splitStringByCommaToArray(request.param("index")))
                .indicesOptions(IndicesOptions.fromRequest(request, IndicesOptions.strictExpandOpen()))
                .humanReadable(request.hasParam("human"))
                .includeDefaults(renderDefaults)
                .names(names);
        getSettingsRequest.local(request.paramAsBoolean("local", getSettingsRequest.local()));
        getSettingsRequest.masterNodeTimeout(request.paramAsTime("master_timeout", getSettingsRequest.masterNodeTimeout()));

        return channel -> client.admin().indices().getSettings(getSettingsRequest, new RestBuilderListener<GetSettingsResponse>(channel) {

            @Override
            public RestResponse buildResponse(GetSettingsResponse getSettingsResponse, XContentBuilder builder) throws Exception {
                getSettingsResponse.toXContent(builder, request);
                return new BytesRestResponse(OK, builder);
            }
        });
    }

}

@@ -920,88 +920,8 @@
 st;%0A
-import org.elasticsearch.action.admin.indices.settings.get.GetSettingsResponse;%0A
 impo
@@ -1142,135 +1142,28 @@
 rch.
-common.xcontent.XContentBuilder;%0Aimport org.elasticsearch.rest.BaseRestHandler;%0Aimport org.elasticsearch.rest.BytesRestResponse
+rest.BaseRestHandler
 ;%0Aim
@@ -1253,52 +1253,8 @@
 st;%0A
-import org.elasticsearch.rest.RestResponse;%0A
 impo
@@ -1286,31 +1286,34 @@
 .action.Rest
-Builder
+ToXContent
 Listener;%0A%0Ai
@@ -1404,60 +1404,8 @@
 GET;
-%0Aimport static org.elasticsearch.rest.RestStatus.OK;
 %0A%0Apu
@@ -3072,17 +3072,16 @@
 ut()));%0A
-%0A
         
@@ -3167,358 +3167,37 @@
 Rest
-BuilderListener%3CGetSettingsResponse%3E(channel) %7B%0A%0A            @Override%0A            public RestResponse buildResponse(GetSettingsResponse getSettingsResponse, XContentBuilder builder) throws Exception %7B%0A                getSettingsResponse.toXContent(builder, request);%0A                return new BytesRestResponse(OK, builder);%0A            %7D%0A        %7D
+ToXContentListener%3C%3E(channel)
 );%0A 
@@ -3201,11 +3201,10 @@
 ;%0A    %7D%0A
-%0A
 %7D%0A

Move RestGetSettingsAction to RestToXContentListener (#31101)