create a send transaction exception on the calling thread and fill its stack, so we know where its coming from

modules/elasticsearch/src/main/java/org/elasticsearch/transport/RemoteTransportException.java

@@ -23,7 +23,7 @@ import org.elasticsearch.ElasticSearchWrapperException;
 import org.elasticsearch.common.transport.TransportAddress;
 
 /**
- * @author kimchy (Shay Banon)
+ * @author kimchy (shay.banon)
  */
 public class RemoteTransportException extends TransportException implements ElasticSearchWrapperException {
 

modules/elasticsearch/src/main/java/org/elasticsearch/transport/SendRequestTransportException.java

@@ -28,5 +28,6 @@ public class SendRequestTransportException extends RemoteTransportException {
 
     public SendRequestTransportException(DiscoveryNode node, String action, Throwable cause) {
         super(node == null ? null : node.name(), node == null ? null : node.address(), action, cause);
+        fillStack();
     }
 }

modules/elasticsearch/src/main/java/org/elasticsearch/transport/TransportService.java

@@ -195,9 +195,10 @@ public class TransportService extends AbstractLifecycleComponent<TransportServic
             }
             // callback that an exception happened, but on a different thread since we don't
             // want handlers to worry about stack overflows
+            final SendRequestTransportException sendRequestException = new SendRequestTransportException(node, action, e);
             threadPool.execute(new Runnable() {
                 @Override public void run() {
-                    handler.handleException(new SendRequestTransportException(node, action, e));
+                    handler.handleException(sendRequestException);
                 }
             });
         }