REST : Split `RestUpgradeAction` into two actions (#29124)

Closes #29062

server/src/main/java/org/elasticsearch/action/ActionModule.java

@@ -275,6 +275,7 @@ import org.elasticsearch.rest.action.admin.indices.RestSplitIndexAction;
 import org.elasticsearch.rest.action.admin.indices.RestSyncedFlushAction;
 import org.elasticsearch.rest.action.admin.indices.RestUpdateSettingsAction;
 import org.elasticsearch.rest.action.admin.indices.RestUpgradeAction;
+import org.elasticsearch.rest.action.admin.indices.RestUpgradeStatusAction;
 import org.elasticsearch.rest.action.admin.indices.RestValidateQueryAction;
 import org.elasticsearch.rest.action.cat.AbstractCatAction;
 import org.elasticsearch.rest.action.cat.RestAliasAction;
@@ -592,6 +593,7 @@ public class ActionModule extends AbstractModule {
         registerHandler.accept(new RestSyncedFlushAction(settings, restController));
         registerHandler.accept(new RestForceMergeAction(settings, restController));
         registerHandler.accept(new RestUpgradeAction(settings, restController));
+        registerHandler.accept(new RestUpgradeStatusAction(settings, restController));
         registerHandler.accept(new RestClearIndicesCacheAction(settings, restController));
 
         registerHandler.accept(new RestIndexAction(settings, restController));

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

@@ -20,8 +20,6 @@
 package org.elasticsearch.rest.action.admin.indices;
 
 import org.elasticsearch.Version;
-import org.elasticsearch.action.admin.indices.upgrade.get.UpgradeStatusRequest;
-import org.elasticsearch.action.admin.indices.upgrade.get.UpgradeStatusResponse;
 import org.elasticsearch.action.admin.indices.upgrade.post.UpgradeRequest;
 import org.elasticsearch.action.admin.indices.upgrade.post.UpgradeResponse;
 import org.elasticsearch.action.support.IndicesOptions;
@@ -40,7 +38,6 @@ import org.elasticsearch.rest.action.RestBuilderListener;
 import java.io.IOException;
 import java.util.Map;
 
-import static org.elasticsearch.rest.RestRequest.Method.GET;
 import static org.elasticsearch.rest.RestRequest.Method.POST;
 import static org.elasticsearch.rest.RestStatus.OK;
 import static org.elasticsearch.rest.action.RestActions.buildBroadcastShardsHeader;
@@ -50,9 +47,6 @@ public class RestUpgradeAction extends BaseRestHandler {
         super(settings);
         controller.registerHandler(POST, "/_upgrade", this);
         controller.registerHandler(POST, "/{index}/_upgrade", this);
-
-        controller.registerHandler(GET, "/_upgrade", this);
-        controller.registerHandler(GET, "/{index}/_upgrade", this);
     }
 
     @Override
@@ -62,30 +56,6 @@ public class RestUpgradeAction extends BaseRestHandler {
 
     @Override
     public RestChannelConsumer prepareRequest(RestRequest request, NodeClient client) throws IOException {
-        if (request.method().equals(RestRequest.Method.GET)) {
-            return handleGet(request, client);
-        } else if (request.method().equals(RestRequest.Method.POST)) {
-            return handlePost(request, client);
-        } else {
-            throw new IllegalArgumentException("illegal method [" + request.method() + "] for request [" + request.path() + "]");
-        }
-    }
-
-    private RestChannelConsumer handleGet(final RestRequest request, NodeClient client) {
-        UpgradeStatusRequest statusRequest = new UpgradeStatusRequest(Strings.splitStringByCommaToArray(request.param("index")));
-        statusRequest.indicesOptions(IndicesOptions.fromRequest(request, statusRequest.indicesOptions()));
-        return channel -> client.admin().indices().upgradeStatus(statusRequest, new RestBuilderListener<UpgradeStatusResponse>(channel) {
-            @Override
-            public RestResponse buildResponse(UpgradeStatusResponse response, XContentBuilder builder) throws Exception {
-                builder.startObject();
-                response.toXContent(builder, request);
-                builder.endObject();
-                return new BytesRestResponse(OK, builder);
-            }
-        });
-    }
-
-    private RestChannelConsumer handlePost(final RestRequest request, NodeClient client) {
         UpgradeRequest upgradeReq = new UpgradeRequest(Strings.splitStringByCommaToArray(request.param("index")));
         upgradeReq.indicesOptions(IndicesOptions.fromRequest(request, upgradeReq.indicesOptions()));
         upgradeReq.upgradeOnlyAncientSegments(request.paramAsBoolean("only_ancient_segments", false));
@@ -107,5 +77,4 @@ public class RestUpgradeAction extends BaseRestHandler {
             }
         });
     }
-
 }

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

@@ -0,0 +1,68 @@
+/*
+ * 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.upgrade.get.UpgradeStatusRequest;
+import org.elasticsearch.action.admin.indices.upgrade.get.UpgradeStatusResponse;
+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.RestController;
+import org.elasticsearch.rest.RestRequest;
+import org.elasticsearch.rest.RestResponse;
+import org.elasticsearch.rest.BytesRestResponse;
+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 RestUpgradeStatusAction extends BaseRestHandler {
+
+    public RestUpgradeStatusAction(Settings settings, RestController controller) {
+        super(settings);
+        controller.registerHandler(GET, "/_upgrade", this);
+        controller.registerHandler(GET, "/{index}/_upgrade", this);
+    }
+
+    @Override
+    public RestChannelConsumer prepareRequest(RestRequest request, NodeClient client) throws IOException {
+        UpgradeStatusRequest statusRequest = new UpgradeStatusRequest(Strings.splitStringByCommaToArray(request.param("index")));
+        statusRequest.indicesOptions(IndicesOptions.fromRequest(request, statusRequest.indicesOptions()));
+        return channel -> client.admin().indices().upgradeStatus(statusRequest, new RestBuilderListener<UpgradeStatusResponse>(channel) {
+            @Override
+            public RestResponse buildResponse(UpgradeStatusResponse response, XContentBuilder builder) throws Exception {
+                builder.startObject();
+                response.toXContent(builder, request);
+                builder.endObject();
+                return new BytesRestResponse(OK, builder);
+            }
+        });
+    }
+
+    @Override
+    public String getName() {
+        return "upgrade_status_action";
+    }
+}