[7.x] Add an allocation decider to prevent allocating shards to nodes which are preparing for shutdown (#71658) #72587
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… are preparing for shutdown (elastic#71658) This PR adds an allocation decider which uses the metadata managed by the Node Shutdown API to prevent shards from being allocated to nodes which are preparing to be removed from the cluster. Additionally, shards will not be auto-expanded to nodes which are preparing to restart, instead waiting until after the restart is complete to expand the shard replication.
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Backports the following commits to 7.x: