Add /_cat endpoint

src/main/java/org/elasticsearch/rest/action/RestActionModule.java

@@ -202,5 +202,6 @@ public class RestActionModule extends AbstractModule {
         bind(org.elasticsearch.rest.action.cat.RestCountAction.class).asEagerSingleton();
         bind(RestRecoveryAction.class).asEagerSingleton();
         bind(RestHealthAction.class).asEagerSingleton();
+        bind(RestCatAction.class).asEagerSingleton();
     }
 }

src/main/java/org/elasticsearch/rest/action/cat/RestCatAction.java

@@ -0,0 +1,53 @@
+/*
+ * Licensed to ElasticSearch and Shay Banon 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.cat;
+
+import org.elasticsearch.client.Client;
+import org.elasticsearch.common.inject.Inject;
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.rest.*;
+
+import java.io.IOException;
+
+import static org.elasticsearch.rest.RestRequest.Method.GET;
+
+public class RestCatAction extends BaseRestHandler {
+
+    private static final String CAT = "=^.^=\n";
+
+    @Inject
+    public RestCatAction(Settings settings, Client client, RestController controller) {
+        super(settings, client);
+        controller.registerHandler(GET, "/_cat", this);
+    }
+
+    @Override
+    public void handleRequest(final RestRequest request, final RestChannel channel) {
+        try {
+            channel.sendResponse(new StringRestResponse(RestStatus.OK, CAT));
+        } catch (Throwable t) {
+            try {
+                channel.sendResponse(new XContentThrowableRestResponse(request, t));
+            } catch (IOException e1) {
+                logger.error("Failed to send failure response", e1);
+            }
+        }
+    }
+}