[DOC+] License not available is KB-ES connection error (#161176)

👋🏼 howdy, team! When Kibana can't connect to Elasticsearch (past finding master /
network issue, just unhealthy cluster ballpark), its code logic cascades
into first tripping warn/error log `license is not available`.

This is a red-herring in that the license can not be determined and user
should investigate the network connection / Elasticsearch health rather
than investigating for lapsed licenses.

Adding this into the "Kibana not ready" docs since it raises at this
point in the flow to hopefully allow users to search-find it in our
official docs rather than e.g. top-goggle-results: [Elastic
Discuss](https://discuss.elastic.co/t/license-not-available/265931),
[external Github](https://github.com/spujadas/elk-docker/issues/349).
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Stef Nestor 2023-07-04 09:26:43 -05:00 committed by GitHub
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@ -61,5 +61,5 @@ curl -XGET elasticsearch_ip_or_hostname:9200/_cat/indices/.kibana,.kibana_task_m
+
For example:
* When {kib} is unable to connect to a healthy {es} cluster, the `master_not_discovered_exception` or `Unable to revive connection` errors appear.
* When {kib} is unable to connect to a healthy {es} cluster, errors like `master_not_discovered_exception` or `unable to revive connection` or `license is not available` errors appear.
* When one or more {kib}-backing indices are unhealthy, the `index_not_green_timeout` error appears.