countDown the latch if no need to delete percolator, introduced when added delete to percolated queries when deleting an index

modules/elasticsearch/src/main/java/org/elasticsearch/action/admin/indices/delete/TransportDeleteIndexAction.java

@@ -104,6 +104,8 @@ public class TransportDeleteIndexAction extends TransportMasterNodeOperationActi
                                 latch.countDown();
                             }
                         });
+                    } else {
+                        latch.countDown();
                     }
                 }