Add debug logging for testRunningTasksCount

Relates #53594

Author: dnhatn

server/src/test/java/org/elasticsearch/action/admin/cluster/node/tasks/TransportTasksActionTests.java

@@ -67,6 +67,7 @@
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
 
 import static org.elasticsearch.action.support.PlainActionFuture.newFuture;
 import static org.hamcrest.Matchers.containsString;
@@ -308,6 +309,9 @@ public void onFailure(Exception e) {
 
         // Check task counts using taskManager
         Map<Long, Task> localTasks = testNodes[0].transportService.getTaskManager().getTasks();
+        logger.info("local tasks [{}]", localTasks.values().stream()
+            .map(t -> Strings.toString(t.taskInfo(testNodes[0].getNodeId(), true)))
+            .collect(Collectors.joining(",")));
         assertEquals(2, localTasks.size()); // all node tasks + 1 coordinating task
         Task coordinatingTask = localTasks.get(Collections.min(localTasks.keySet()));
         Task subTask = localTasks.get(Collections.max(localTasks.keySet()));