**Build scan:**
https://gradle-enterprise.elastic.co/s/7qx3wpwitkdiq/tests/:server:internalClusterTest/org.elasticsearch.action.admin.cluster.node.tasks.CancellableTasksIT/testChildrenTasksCancelledOnTimeout

**Reproduction line:**
```
./gradlew ':server:internalClusterTest' --tests "org.elasticsearch.action.admin.cluster.node.tasks.CancellableTasksIT.testChildrenTasksCancelledOnTimeout" -Dtests.seed=9F784DDF2A59F914 -Dtests.locale=es-US -Dtests.timezone=Asia/Ujung_Pandang -Druntime.java=20
```

**Applicable branches:**
main

**Reproduces locally?:**
No

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.action.admin.cluster.node.tasks.CancellableTasksIT&tests.test=testChildrenTasksCancelledOnTimeout

**Failure excerpt:**
```
java.lang.AssertionError: expected:<0> but was:<2>

  at __randomizedtesting.SeedInfo.seed([9F784DDF2A59F914:6F379BC970940468]:0)
  at org.junit.Assert.fail(Assert.java:88)
  at org.junit.Assert.failNotEquals(Assert.java:834)
  at org.junit.Assert.assertEquals(Assert.java:645)
  at org.junit.Assert.assertEquals(Assert.java:631)
  at org.elasticsearch.action.admin.cluster.node.tasks.CancellableTasksIT.lambda$testChildrenTasksCancelledOnTimeout$9(CancellableTasksIT.java:390)
  at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:1152)
  at org.elasticsearch.action.admin.cluster.node.tasks.CancellableTasksIT.testChildrenTasksCancelledOnTimeout(CancellableTasksIT.java:386)
  at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
  at java.lang.reflect.Method.invoke(Method.java:578)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1758)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:946)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:982)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:996)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:48)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.tests.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:45)
  at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:843)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:490)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:955)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:840)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:891)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:902)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:38)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.tests.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:47)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:850)
  at java.lang.Thread.run(Thread.java:1623)

```
server/src/internalClusterTest/java/org/elasticsearch/action/admin/cluster/node/tasks/CancellableTasksIT.java
TransportService transportService = internalCluster().getInstance(TransportService.class, node.getName());
                for (ThreadPoolStats.Stats stat : transportService.getThreadPool().stats()) {
                    assertEquals(0, stat.getActive());
                    assertEquals(0, stat.getQueue());
                }
            }
        }, 60L, TimeUnit.SECONDS);
        ensureBansAndCancellationsConsistency();
    }
    static TaskId getRootTaskId(TestRequest request) throws Exception {
        SetOnce<TaskId> taskId = new SetOnce<>();
        assertBusy(() -> {
            ListTasksResponse listTasksResponse = client().admin()
                .cluster()
                .prepareListTasks()
                .setActions(TransportTestAction.ACTION.name())
                .setDetailed(true)
                .get();
            List<TaskInfo> tasks = listTasksResponse.getTasks()
                .stream()
                .filter(t -> t.description().equals(request.taskDescription()))
                .toList();
            assertThat(tasks, hasSize(1));
            taskId.set(tasks.get(0).taskId());
        });
        return taskId.get();
    }
    static void waitForRootTask(ActionFuture<TestResponse> rootTask, boolean expectToTimeout) {
        try {
            rootTask.actionGet();