diff --git a/server/src/main/java/org/elasticsearch/action/admin/cluster/tasks/PendingClusterTasksResponse.java b/server/src/main/java/org/elasticsearch/action/admin/cluster/tasks/PendingClusterTasksResponse.java
index 391fb96d904e8..1a16d3e8816be 100644
--- a/server/src/main/java/org/elasticsearch/action/admin/cluster/tasks/PendingClusterTasksResponse.java
+++ b/server/src/main/java/org/elasticsearch/action/admin/cluster/tasks/PendingClusterTasksResponse.java
@@ -49,6 +49,7 @@ public String toString() {
                 .append(pendingClusterTask.getSource())
                 .append("/")
                 .append(pendingClusterTask.getTimeInQueue())
+                .append(pendingClusterTask.executing() ? "[executing]" : "")
                 .append("\n");
         }
         return sb.toString();