**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
CancellableTask childTask = (CancellableTask) childTasks.get(0);
                            assertTrue(childTask.isCancelled());
                            expectedBans.add(childTask.getParentTaskId());
                        }
                    }
                    assertThat(taskManager.getBannedTaskIds(), equalTo(expectedBans));
                }
            }, 30, TimeUnit.SECONDS);
        } finally {
            allowEntireRequest(rootRequest);
            cancelFuture.actionGet();
            waitForRootTask(rootTaskFuture, false);
            ensureBansAndCancellationsConsistency();
        }
    }
    public void testCancelTaskMultipleTimes() throws Exception {
        Set<DiscoveryNode> nodes = clusterService().state().nodes().stream().collect(Collectors.toSet());
        TestRequest rootRequest = generateTestRequest(nodes, 0, randomIntBetween(1, 3), false);
        ActionFuture<TestResponse> mainTaskFuture = client().execute(TransportTestAction.ACTION, rootRequest);
        TaskId taskId = getRootTaskId(rootRequest);
        allowPartialRequest(rootRequest);
        CancelTasksResponse resp = client().admin().cluster().prepareCancelTasks().setTargetTaskId(taskId).waitForCompletion(false).get();
        assertThat(resp.getTaskFailures(), empty());
        assertThat(resp.getNodeFailures(), empty());
        ActionFuture<CancelTasksResponse> cancelFuture = client().admin()
            .cluster()
            .prepareCancelTasks()
            .setTargetTaskId(taskId)
            .waitForCompletion(true)
            .execute();