[8.8] [DOCS] Fixes errors in Troubleshoot Kibana UI error (elastic#15…

…8855) (elastic#161139)

# Backport

This will backport the following commits from `main` to `8.8`:
- [[DOCS] Fixes errors in Troubleshoot Kibana UI error
(elastic#158855)](elastic#158855)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Fixes errors in Troubleshoot Kibana UI error (elastic#158855)\n\n##
Summary\r\n\r\nUpdates `Troubleshoot Kibana UI error` with the following
fixes:\r\n\r\n- {kib} in error code should Kibana\r\n- code shouldn’t
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Fixes errors in Troubleshoot Kibana UI error (elastic#158855)\n\n##
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Fixes errors in Troubleshoot Kibana UI error (elastic#158855)\n\n##
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BACKPORT-->

Co-authored-by: Kaarina Tungseth <[email protected]>

docs/setup/access.asciidoc

@@ -39,19 +39,27 @@ For JSON-formatted server status details, use the `localhost:5601/api/status` AP
 
 [float]
 [[not-ready]]
-=== {kib} not ready
+=== Troubleshoot {kib} UI error
 
-If you receive an error that the {kib} `server is not ready`, check the following:
+Troubleshoot the `Kibana Server is not Ready yet` error.
 
-* The {es} connectivity: 
+. From within a {kib} node, confirm the connection to {es}:
 +
 [source,sh]
 ----
-`curl -XGET elasticsearch_ip_or_hostname:9200/`
+curl -XGET elasticsearch_ip_or_hostname:9200/
 ----
-* The {kib} logs:
-** Linux, DEB or RPM package: `/var/log/kibana/kibana.log`
-** Linux, tar.gz package: `$KIBANA_HOME/log/kibana.log`
-** Windows: `$KIBANA_HOME\log\kibana.log`
-* The health status of `.kibana*` indices
+. Guarantee the health of the three {kib}-backing indices.  All indices must appear and display `status:green` and `status:open`:
++
+[source,sh]
+----
+curl -XGET elasticsearch_ip_or_hostname:9200/_cat/indices/.kibana,.kibana_task_manager,.kibana_security_session?v=true
+----
+. <<start-stop,Shut down all {kib} nodes>>. 
+. Choose any {kib} node, then update the config to set the <<change-overall-log-level,debug logging>>.
+. <<start-stop,Start the node>>, then check the start-up debug logs for `ERROR` messages or other start-up issues. 
++
+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 one or more {kib}-backing indices are unhealthy, the `index_not_green_timeout` error appears.