[8.15] Add a cluster listener to fix missing cluster features after upgrade (#110710) #110924
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…lastic#110710) Non-master-eligible nodes that are already part of a cluster when the master is upgraded don't re-join the cluster, so their cluster features never get updated. This adds a cluster listener that spots this occurring, and manually gets the node's features with a new transport action and updates the cluster state after the fact.
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Backports the following commits to 8.15: