Removed the operation_threaded option.

This low level option isn't worth the complexity and an operation should never happen on the network thread.

core/src/main/java/org/elasticsearch/action/support/broadcast/TransportBroadcastAction.java

@@ -47,7 +47,6 @@
 public abstract class TransportBroadcastAction<Request extends BroadcastRequest, Response extends BroadcastResponse, ShardRequest extends BroadcastShardRequest, ShardResponse extends BroadcastShardResponse>
         extends HandledTransportAction<Request, Response> {
 
-    protected final ThreadPool threadPool;
     protected final ClusterService clusterService;
     protected final TransportService transportService;
 
@@ -59,7 +58,6 @@ protected TransportBroadcastAction(Settings settings, String actionName, ThreadP
         super(settings, actionName, threadPool, transportService, actionFilters, indexNameExpressionResolver, request);
         this.clusterService = clusterService;
         this.transportService = transportService;
-        this.threadPool = threadPool;
         this.transportShardAction = actionName + "[s]";
 
         transportService.registerRequestHandler(transportShardAction, shardRequest, shardExecutor, new ShardTransportHandler());

core/src/main/java/org/elasticsearch/action/support/replication/ReplicationRequest.java

@@ -46,7 +46,6 @@ public abstract class ReplicationRequest<T extends ReplicationRequest> extends A
     protected TimeValue timeout = DEFAULT_TIMEOUT;
     protected String index;
 
-    private boolean threadedOperation = true;
     private WriteConsistencyLevel consistencyLevel = WriteConsistencyLevel.DEFAULT;
     private volatile boolean canHaveDuplicates = false;
 
@@ -76,7 +75,6 @@ protected ReplicationRequest(T request, ActionRequest originalRequest) {
         super(originalRequest);
         this.timeout = request.timeout();
         this.index = request.index();
-        this.threadedOperation = request.operationThreaded();
         this.consistencyLevel = request.consistencyLevel();
     }
 
@@ -91,23 +89,6 @@ public boolean canHaveDuplicates() {
         return canHaveDuplicates;
     }
 
-    /**
-     * Controls if the operation will be executed on a separate thread when executed locally.
-     */
-    public final boolean operationThreaded() {
-        return threadedOperation;
-    }
-
-    /**
-     * Controls if the operation will be executed on a separate thread when executed locally. Defaults
-     * to <tt>true</tt> when running in embedded mode.
-     */
-    @SuppressWarnings("unchecked")
-    public final T operationThreaded(boolean threadedOperation) {
-        this.threadedOperation = threadedOperation;
-        return (T) this;
-    }
-
     /**
      * A timeout to wait if the index operation can't be performed immediately. Defaults to <tt>1m</tt>.
      */

core/src/main/java/org/elasticsearch/action/support/replication/ReplicationRequestBuilder.java

@@ -35,16 +35,6 @@ protected ReplicationRequestBuilder(ElasticsearchClient client, Action<Request,
         super(client, action, request);
     }
 
-    /**
-     * Controls if the operation will be executed on a separate thread when executed locally. Defaults
-     * to <tt>true</tt> when running in embedded mode.
-     */
-    @SuppressWarnings("unchecked")
-    public final RequestBuilder setOperationThreaded(boolean threadedOperation) {
-        request.operationThreaded(threadedOperation);
-        return (RequestBuilder) this;
-    }
-
     /**
      * A timeout to wait if the index operation can't be performed immediately. Defaults to <tt>1m</tt>.
      */

core/src/main/java/org/elasticsearch/action/support/replication/TransportReplicationAction.java

@@ -211,8 +211,6 @@ public <T extends ActionWriteResponse> T response() {
     class OperationTransportHandler implements TransportRequestHandler<Request> {
         @Override
         public void messageReceived(final Request request, final TransportChannel channel) throws Exception {
-            // if we have a local operation, execute it on a thread since we don't spawn
-            request.operationThreaded(true);
             execute(request, new ActionListener<Response>() {
                 @Override
                 public void onResponse(Response result) {
@@ -440,21 +438,17 @@ protected ShardRouting resolvePrimary(ShardIterator shardIt) {
         protected void routeRequestOrPerformLocally(final ShardRouting primary, final ShardIterator shardsIt) {
             if (primary.currentNodeId().equals(observer.observedState().nodes().localNodeId())) {
                 try {
-                    if (internalRequest.request().operationThreaded()) {
-                        threadPool.executor(executor).execute(new AbstractRunnable() {
-                            @Override
-                            public void onFailure(Throwable t) {
-                                finishAsFailed(t);
-                            }
+                    threadPool.executor(executor).execute(new AbstractRunnable() {
+                        @Override
+                        public void onFailure(Throwable t) {
+                            finishAsFailed(t);
+                        }
 
-                            @Override
-                            protected void doRun() throws Exception {
-                                performOnPrimary(primary, shardsIt);
-                            }
-                        });
-                    } else {
-                        performOnPrimary(primary, shardsIt);
-                    }
+                        @Override
+                        protected void doRun() throws Exception {
+                            performOnPrimary(primary, shardsIt);
+                        }
+                    });
                 } catch (Throwable t) {
                     finishAsFailed(t);
                 }
@@ -506,9 +500,6 @@ void retry(Throwable failure) {
                 finishAsFailed(failure);
                 return;
             }
-            // make it threaded operation so we fork on the discovery listener thread
-            internalRequest.request().operationThreaded(true);
-
             observer.waitForNextChange(new ClusterStateObserver.Listener() {
                 @Override
                 public void onNewClusterState(ClusterState state) {
@@ -904,43 +895,33 @@ public void handleException(TransportException exp) {
 
                         });
             } else {
-                if (replicaRequest.operationThreaded()) {
-                    try {
-                        threadPool.executor(executor).execute(new AbstractRunnable() {
-                            @Override
-                            protected void doRun() {
-                                try {
-                                    shardOperationOnReplica(shard.shardId(), replicaRequest);
-                                    onReplicaSuccess();
-                                } catch (Throwable e) {
-                                    onReplicaFailure(nodeId, e);
-                                    failReplicaIfNeeded(shard.index(), shard.id(), e);
-                                }
+                try {
+                    threadPool.executor(executor).execute(new AbstractRunnable() {
+                        @Override
+                        protected void doRun() {
+                            try {
+                                shardOperationOnReplica(shard.shardId(), replicaRequest);
+                                onReplicaSuccess();
+                            } catch (Throwable e) {
+                                onReplicaFailure(nodeId, e);
+                                failReplicaIfNeeded(shard.index(), shard.id(), e);
                             }
+                        }
 
-                            // we must never reject on because of thread pool capacity on replicas
-                            @Override
-                            public boolean isForceExecution() {
-                                return true;
-                            }
+                        // we must never reject on because of thread pool capacity on replicas
+                        @Override
+                        public boolean isForceExecution() {
+                            return true;
+                        }
 
-                            @Override
-                            public void onFailure(Throwable t) {
-                                onReplicaFailure(nodeId, t);
-                            }
-                        });
-                    } catch (Throwable e) {
-                        failReplicaIfNeeded(shard.index(), shard.id(), e);
-                        onReplicaFailure(nodeId, e);
-                    }
-                } else {
-                    try {
-                        shardOperationOnReplica(shard.shardId(), replicaRequest);
-                        onReplicaSuccess();
-                    } catch (Throwable e) {
-                        failReplicaIfNeeded(shard.index(), shard.id(), e);
-                        onReplicaFailure(nodeId, e);
-                    }
+                        @Override
+                        public void onFailure(Throwable t) {
+                            onReplicaFailure(nodeId, t);
+                        }
+                    });
+                } catch (Throwable e) {
+                    failReplicaIfNeeded(shard.index(), shard.id(), e);
+                    onReplicaFailure(nodeId, e);
                 }
             }
         }

core/src/main/java/org/elasticsearch/action/update/UpdateHelper.java

@@ -131,7 +131,6 @@ protected Result prepare(UpdateRequest request, final GetResult getResult) {
                     .routing(request.routing())
                     .parent(request.parent())
                     .consistencyLevel(request.consistencyLevel());
-            indexRequest.operationThreaded(false);
             if (request.versionType() != VersionType.INTERNAL) {
                 // in all but the internal versioning mode, we want to create the new document using the given version.
                 indexRequest.version(request.version()).versionType(request.versionType());
@@ -227,13 +226,11 @@ protected Result prepare(UpdateRequest request, final GetResult getResult) {
                     .consistencyLevel(request.consistencyLevel())
                     .timestamp(timestamp).ttl(ttl)
                     .refresh(request.refresh());
-            indexRequest.operationThreaded(false);
             return new Result(indexRequest, Operation.INDEX, updatedSourceAsMap, updateSourceContentType);
         } else if ("delete".equals(operation)) {
             DeleteRequest deleteRequest = Requests.deleteRequest(request.index()).type(request.type()).id(request.id()).routing(routing).parent(parent)
                     .version(updateVersion).versionType(request.versionType())
                     .consistencyLevel(request.consistencyLevel());
-            deleteRequest.operationThreaded(false);
             return new Result(deleteRequest, Operation.DELETE, updatedSourceAsMap, updateSourceContentType);
         } else if ("none".equals(operation)) {
             UpdateResponse update = new UpdateResponse(getResult.getIndex(), getResult.getType(), getResult.getId(), getResult.getVersion(), false);

core/src/main/java/org/elasticsearch/rest/action/delete/RestDeleteAction.java

@@ -50,9 +50,6 @@ public RestDeleteAction(Settings settings, RestController controller, Client cli
     @Override
     public void handleRequest(final RestRequest request, final RestChannel channel, final Client client) {
         DeleteRequest deleteRequest = new DeleteRequest(request.param("index"), request.param("type"), request.param("id"));
-
-        deleteRequest.operationThreaded(true);
-
         deleteRequest.routing(request.param("routing"));
         deleteRequest.parent(request.param("parent")); // order is important, set it after routing, so it will set the routing
         deleteRequest.timeout(request.paramAsTime("timeout", DeleteRequest.DEFAULT_TIMEOUT));

core/src/main/java/org/elasticsearch/rest/action/index/RestIndexAction.java

@@ -70,7 +70,6 @@ public void handleRequest(RestRequest request, RestChannel channel, final Client
     @Override
     public void handleRequest(final RestRequest request, final RestChannel channel, final Client client) {
         IndexRequest indexRequest = new IndexRequest(request.param("index"), request.param("type"), request.param("id"));
-        indexRequest.operationThreaded(true);
         indexRequest.routing(request.param("routing"));
         indexRequest.parent(request.param("parent")); // order is important, set it after routing, so it will set the routing
         indexRequest.timestamp(request.param("timestamp"));

core/src/test/java/org/elasticsearch/action/support/replication/ShardReplicationTests.java

@@ -661,7 +661,6 @@ static class Request extends ReplicationRequest<Request> {
         public AtomicInteger processedOnReplicas = new AtomicInteger();
 
         Request() {
-            this.operationThreaded(randomBoolean());
         }
 
         Request(ShardId shardId) {