restore compute-group description

Author: dnhatn

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/plugin/ClusterComputeHandler.java

@@ -110,7 +110,7 @@ void startComputeOnRemoteCluster(
                     groupTask = rootTask;
                     onGroupFailure = cancelQueryOnFailure;
                 } else {
-                    groupTask = computeService.createGroupTask(rootTask);
+                    groupTask = computeService.createGroupTask(rootTask, () -> "compute group: cluster [" + clusterAlias + "]");
                     onGroupFailure = computeService.cancelQueryOnFailure(groupTask);
                     l = ActionListener.runAfter(l, () -> transportService.getTaskManager().unregister(groupTask));
                 }

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/plugin/ComputeService.java

@@ -414,15 +414,12 @@ Runnable cancelQueryOnFailure(CancellableTask task) {
         });
     }
 
-    CancellableTask createGroupTask(Task parentTask) {
+    CancellableTask createGroupTask(Task parentTask, Supplier<String> description) {
         final TaskManager taskManager = transportService.getTaskManager();
         return (CancellableTask) taskManager.register(
             "transport",
             "esql_compute_group",
-            new ComputeGroupTaskRequest(
-                parentTask.taskInfo(transportService.getLocalNode().getId(), false).taskId(),
-                parentTask::getDescription
-            )
+            new ComputeGroupTaskRequest(parentTask.taskInfo(transportService.getLocalNode().getId(), false).taskId(), description)
         );
     }
 

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/plugin/DataNodeComputeHandler.java

@@ -130,7 +130,10 @@ protected void sendRequest(
                         final Runnable onGroupFailure;
                         final CancellableTask groupTask;
                         if (allowPartialResults) {
-                            groupTask = computeService.createGroupTask(parentTask);
+                            groupTask = computeService.createGroupTask(
+                                parentTask,
+                                () -> "compute group: data-node [" + node.getName() + "], " + shardIds + " [" + shardIds + "]"
+                            );
                             onGroupFailure = computeService.cancelQueryOnFailure(groupTask);
                             l = ActionListener.runAfter(l, () -> transportService.getTaskManager().unregister(groupTask));
                         } else {