no need to spawn a thread when response to a ping response

modules/elasticsearch/src/main/java/org/elasticsearch/discovery/zen/fd/MasterFaultDetection.java

@@ -319,6 +319,12 @@ public class MasterFaultDetection extends AbstractComponent {
             // send a response, and note if we are connected to the master or not
             channel.sendResponse(new MasterPingResponseResponse(nodes.nodeExists(request.nodeId)));
         }
+
+
+        @Override public boolean spawn() {
+            // no need to spawn here, we just send a response
+            return false;
+        }
     }
 
 

modules/elasticsearch/src/main/java/org/elasticsearch/discovery/zen/fd/NodesFaultDetection.java

@@ -266,6 +266,11 @@ public class NodesFaultDetection extends AbstractComponent {
             }
             channel.sendResponse(new PingResponse());
         }
+
+        @Override public boolean spawn() {
+            // no need to spawn here, we just send a response
+            return false;
+        }
     }