improve stack trace when failing to send a transaction request

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

@@ -28,6 +28,9 @@ 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();
+    }
+
+    @Override public Throwable fillInStackTrace() {
+        return super.fillStack();
     }
 }