Welcome to the community! I see from your cluster health output that the status is yellow:
It could be the case that this is causing your issues. I would recommend checking the state of your shards and check if any of the proposed fixes resolve your issue as per the troubleshooting guide.
Just an aside that the version of Kibana you're using is past EOL, so we would recommend upgrading when you can.
Because we have only one data_node. ( "number_of_data_nodes" : 1,)
But our Kibana console working very slow. Maybe you have any advices and recommendation how we can speed up our kibana console ?
Also what we can do with "unassigned_shards" ?
If they have "explanation" : "a copy of this shard is already allocated to this node ? After changes what we did.
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