When upgrading our elasticsearch cluster to version 7.16.1, we performing a rolling upgarde as described in the documentation . Before the restart we trigger a synced flush and increase cluster.routing.allocation.node_concurrent_recoveries to 32. After the shard allocation was enabled the node logs …

Warning "Unable to acquire permit to use snapshot files during recovery…" when restarting elasticsearch node

DavidTurner (David Turner) January 25, 2022, 6:02am 3

That'd explain it. Don't change this setting.

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UNASSIGNED state after REPLICA_ADDED

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