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 this.tasks.addAll(tasks);\n+                return BatchResult.<Integer>builder().successes(tasks).build(ClusterState.builder(currentState).build());\n+            }\n+\n+            @Override\n+            public boolean runOnlyOnMaster() {\n+                return false;\n+            }\n+        }\n+\n+        int numberOfThreads = randomIntBetween(2, 8);\n+        TaskExecutor[] executors = new TaskExecutor[numberOfThreads];\n+        for (int i = 0; i < numberOfThreads; i++) {\n+            executors[i] = new TaskExecutor();\n+        }\n+\n+        int tasksSubmittedPerThread = randomIntBetween(2, 1024);\n+\n+        AtomicBoolean failure = new AtomicBoolean();\n+        CountDownLatch updateLatch = new CountDownLatch(numberOfThreads * tasksSubmittedPerThread);\n+\n+        ClusterStateTaskListener listener = new ClusterStateTaskListener() {\n+            @Override\n+            public void onFailure(String source, Throwable t) {\n+                logger.debug(\"unexpected failure: [{}]\", t, source);\n+                failure.set(true);","path":"core/src/test/java/org/elasticsearch/cluster/ClusterServiceIT.java","position":null,"original_position":43,"commit_id":"17ff33ea0a8311b08feed042c257a454e67e8954","original_commit_id":"750a9900abe9907818c7f5e5a16a29e22be31d2b","user":{"login":"jasontedor","id":4744941,"avatar_url":"https://avatars.githubusercontent.com/u/4744941?v=3","gravatar_id":"","url":"https://api.github.com/users/jasontedor","html_url":"https://github.com/jasontedor","followers_url":"https://api.github.com/users/jasontedor/followers","following_url":"https://api.github.com/users/jasontedor/following{/other_user}","gists_url":"https://api.github.com/users/jasontedor/gists{/gist_id}","starred_url":"https://api.github.com/users/jasontedor/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasontedor/subscriptions","organizations_url":"https://api.github.com/users/jasontedor/orgs","repos_url":"https://api.github.com/users/jasontedor/repos","events_url":"https://api.github.com/users/jasontedor/events{/privacy}","received_events_url":"https://api.github.com/users/jasontedor/received_events","type":"User","site_admin":false},"body":"I 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ensures that cluster state update tasks\r\nare executed in order from the perspective of a single thread.\r\n\r\nCloses #15483 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