Clean up TransportMasterNodeAction (#34076)

Mainly this fixes a warning by replacing the unchecked `new ActionListener`
with the checked `new ActionListener<Response>`, and it also fixes the line
length violations in this class.

buildSrc/src/main/resources/checkstyle_suppressions.xml

@@ -166,7 +166,6 @@
   <suppress files="server[/\\]src[/\\]main[/\\]java[/\\]org[/\\]elasticsearch[/\\]action[/\\]support[/\\]master[/\\]AcknowledgedRequestBuilder.java" checks="LineLength" />
   <suppress files="server[/\\]src[/\\]main[/\\]java[/\\]org[/\\]elasticsearch[/\\]action[/\\]support[/\\]master[/\\]MasterNodeOperationRequestBuilder.java" checks="LineLength" />
   <suppress files="server[/\\]src[/\\]main[/\\]java[/\\]org[/\\]elasticsearch[/\\]action[/\\]support[/\\]master[/\\]MasterNodeReadOperationRequestBuilder.java" checks="LineLength" />
-  <suppress files="server[/\\]src[/\\]main[/\\]java[/\\]org[/\\]elasticsearch[/\\]action[/\\]support[/\\]master[/\\]TransportMasterNodeAction.java" checks="LineLength" />
   <suppress files="server[/\\]src[/\\]main[/\\]java[/\\]org[/\\]elasticsearch[/\\]action[/\\]support[/\\]master[/\\]info[/\\]ClusterInfoRequest.java" checks="LineLength" />
   <suppress files="server[/\\]src[/\\]main[/\\]java[/\\]org[/\\]elasticsearch[/\\]action[/\\]support[/\\]master[/\\]info[/\\]ClusterInfoRequestBuilder.java" checks="LineLength" />
   <suppress files="server[/\\]src[/\\]main[/\\]java[/\\]org[/\\]elasticsearch[/\\]action[/\\]support[/\\]master[/\\]info[/\\]TransportClusterInfoAction.java" checks="LineLength" />

server/src/main/java/org/elasticsearch/action/support/master/TransportMasterNodeAction.java

@@ -38,7 +38,7 @@ import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.io.stream.Writeable;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.unit.TimeValue;
-import org.elasticsearch.discovery.Discovery;
+import org.elasticsearch.discovery.Discovery.FailedToCommitClusterStateException;
 import org.elasticsearch.discovery.MasterNotDiscoveredException;
 import org.elasticsearch.node.NodeClosedException;
 import org.elasticsearch.tasks.Task;
@@ -53,13 +53,15 @@ import java.util.function.Supplier;
 /**
  * A base class for operations that needs to be performed on the master node.
  */
-public abstract class TransportMasterNodeAction<Request extends MasterNodeRequest<Request>, Response extends ActionResponse> extends HandledTransportAction<Request, Response> {
+public abstract class TransportMasterNodeAction<Request extends MasterNodeRequest<Request>, Response extends ActionResponse>
+    extends HandledTransportAction<Request, Response> {
+
     protected final ThreadPool threadPool;
     protected final TransportService transportService;
     protected final ClusterService clusterService;
     protected final IndexNameExpressionResolver indexNameExpressionResolver;
 
-    final String executor;
+    private final String executor;
 
     protected TransportMasterNodeAction(Settings settings, String actionName, TransportService transportService,
                                         ClusterService clusterService, ThreadPool threadPool, ActionFilters actionFilters,
@@ -75,7 +77,8 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
 
     protected TransportMasterNodeAction(Settings settings, String actionName, boolean canTripCircuitBreaker,
                                         TransportService transportService, ClusterService clusterService, ThreadPool threadPool,
-                                        ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver, Supplier<Request> request) {
+                                        ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver,
+                                        Supplier<Request> request) {
         super(settings, actionName, canTripCircuitBreaker, transportService, actionFilters, request);
         this.transportService = transportService;
         this.clusterService = clusterService;
@@ -138,7 +141,8 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
 
         public void start() {
             ClusterState state = clusterService.state();
-            this.observer = new ClusterStateObserver(state, clusterService, request.masterNodeTimeout(), logger, threadPool.getThreadContext());
+            this.observer
+                = new ClusterStateObserver(state, clusterService, request.masterNodeTimeout(), logger, threadPool.getThreadContext());
             doStart(state);
         }
 
@@ -174,16 +178,16 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
 
                             @Override
                             public void onFailure(Exception t) {
-                                if (t instanceof Discovery.FailedToCommitClusterStateException
-                                    || (t instanceof NotMasterException)) {
-                                    logger.debug(() -> new ParameterizedMessage("master could not publish cluster state or stepped down before publishing action [{}], scheduling a retry", actionName), t);
+                                if (t instanceof FailedToCommitClusterStateException || t instanceof NotMasterException) {
+                                    logger.debug(() -> new ParameterizedMessage("master could not publish cluster state or " +
+                                        "stepped down before publishing action [{}], scheduling a retry", actionName), t);
                                     retry(t, masterChangePredicate);
                                 } else {
                                     listener.onFailure(t);
                                 }
                             }
                         };
-                        threadPool.executor(executor).execute(new ActionRunnable(delegate) {
+                        threadPool.executor(executor).execute(new ActionRunnable<Response>(delegate) {
                             @Override
                             protected void doRun() throws Exception {
                                 masterOperation(task, request, clusterState, delegate);
@@ -204,7 +208,8 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
                                 Throwable cause = exp.unwrapCause();
                                 if (cause instanceof ConnectTransportException) {
                                     // we want to retry here a bit to see if a new master is elected
-                                    logger.debug("connection exception while trying to forward request with action name [{}] to master node [{}], scheduling a retry. Error: [{}]",
+                                    logger.debug("connection exception while trying to forward request with action name [{}] to " +
+                                            "master node [{}], scheduling a retry. Error: [{}]",
                                         actionName, nodes.getMasterNode(), exp.getDetailedMessage());
                                     retry(cause, masterChangePredicate);
                                 } else {
@@ -234,7 +239,8 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
 
                     @Override
                     public void onTimeout(TimeValue timeout) {
-                        logger.debug(() -> new ParameterizedMessage("timed out while retrying [{}] after failure (timeout [{}])", actionName, timeout), failure);
+                        logger.debug(() -> new ParameterizedMessage("timed out while retrying [{}] after failure (timeout [{}])",
+                            actionName, timeout), failure);
                         listener.onFailure(new MasterNotDiscoveredException(failure));
                     }
                 }, statePredicate