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4379a3c52b
Due to #47003 many clusters will have built up a large backlog of expired results. On upgrading to a version where that bug is fixed users could find that the first ML daily maintenance task deletes a very large amount of documents. This change introduces throttling to the delete-by-query that the ML daily maintenance uses to delete expired results to limit it to deleting an average 200 documents per second. (There is no throttling for state/forecast documents as these are expected to be lower volume.) Additionally a rough time limit of 8 hours is applied to the whole delete expired data action. (This is only rough as it won't stop part way through a single operation - it only checks the timeout between operations.) Relates #47103
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