[7.x] Clean up ShardFollowTasks for deleted indices (#44702) #44790
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Deleting a follower index does not delete its ShardFollowTasks, potentially leaving many persistent tasks in the cluster that cannot be allocated on nodes and unnecessary fill the logs. This commit adds a cluster state listener (ShardFollowTaskCleaner) that completes (with a failure) any persistent task that refers to a non existent follower index. I think that this bug has been introduced by elastic#34404: before this change the task would have been completed as failed and removed from the cluster state.
…ex (elastic#44801) This commit unmutes and renames the test that failed on CI (elastic#44796) after elastic#44702 has been merged. This test assumes that follow stats still exist after a follower index has been deleted. The follow stats are based on persistent tasks, and since elastic#44702 the persistent tasks of deleted following indices are now automatically cleaned up to avoid to bloat the cluster state. I don't think we should report any follow stats for deleted indices and I don't think that this test makes much sense now the tasks are cleaned up. This is why the test has been renamed. closes elastic#44796
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Deleting a follower index does not delete its ShardFollowTasks, potentially
leaving many persistent tasks in the cluster that cannot be allocated on
nodes and unnecessary fill the logs. This commit adds a cluster state listener
(ShardFollowTaskCleaner) that completes (with a failure) any persistent task
that refers to a non existent follower index.
I think that this bug has been introduced by #34404: before this change the
task would have been completed as failed and removed from the cluster state.
Backport of #44702