Move RestGetSettingsAction to RestToXContentListener (#31101)

Author: javanna

server/src/main/java/org/elasticsearch/rest/action/admin/indices/RestGetSettingsAction.java

@@ -20,23 +20,18 @@
 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 org.elasticsearch.rest.action.RestToXContentListener;
 
 import java.io.IOException;
 
 import static org.elasticsearch.rest.RestRequest.Method.GET;
-import static org.elasticsearch.rest.RestStatus.OK;
 
 public class RestGetSettingsAction extends BaseRestHandler {
 
@@ -68,15 +63,6 @@ public RestChannelConsumer prepareRequest(final RestRequest request, final NodeC
                 .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);
-            }
-        });
+        return channel -> client.admin().indices().getSettings(getSettingsRequest, new RestToXContentListener<>(channel));
     }
-
 }