[7.x] [Task Manager] ignore version conflicts that exceed max_docs in the claiming process (#89415) #89540
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…laiming process (elastic#89415) This is a first step in attempting to address the over zealous shifting we've identified in TM. It [turns out](elastic/elasticsearch#63671) `version_conflicts` don't always count against `max_docs`, so in this PR we correct the `version_conflicts` returned by updateByQuery in TaskManager to only count the conflicts that _may_ have counted against `max_docs`. This correction isn't necessarily accurate, but it will ensure we don't shift if we are in fact managing to claim tasks.
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Backports the following commits to 7.x: