This means that the logged in user doesn't have the right set of privileges. When and where do you see that error? In Kibana? When you log in? Or in a log file?
To Just use Kibana and have access to the data in an index, a user would typically only require;
kibana_user
a role with read and view_index_metadata privs on that particular index (and no cluster privs)
You could turn on audit logging in your Elasticsearch cluster and that would show you what user it is getting the error and what index they are accessing.
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