Fix autoexpand during node replace #98891
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Prior to this change NodeReplacementAllocationDecider was unconditionally skipping both replacement source and target nodes when calculation auto-expand replicas. This is fixed by autoexpanding to the replacement node if source node already had shards of the index Backport of PR elastic#96281 amended for 7.17.x Closes elastic#89527
kingherc
added
>bug
:Distributed/Allocation
idegtiarenko
approved these changes
Aug 28, 2023
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Backport of PR #96281 amended for 7.17.x. As a reviewer, it may be a good idea to compare the diff of this PR with the diff of this PR.
Tried to be as least intrusive to the allocation decision explanations of 7.17.x as possible.
Closes #89527