I see following message through Dev Tools in Kibana:
#! Deprecation: In a future major version, this request will fail because this action would add [10] total shards, but this cluster currently has [9556]/[5000] maximum shards open. Before upgrading, reduce the number of shards in your cluster or adjust the cluster setting [cluster.max_shards_per_node].
That is indeed a new warning that you have far too many shards for a cluster that size. Please read this blog post on shards and siding practices and work to reduce that significantly.
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