* [DOCS] Describe how to use Elastic Agent to monitor Elasticsearch
* Temporarily fix doc build
* Add question about showing Elastic Agent metrics in the monitoring UI
* Apply changes from review
* Activate link to Kibana docs
* Fix broken link
* Update docs/reference/monitoring/indices.asciidoc
Removes `testenv` annotations and related code. These annotations originally let you skip x-pack snippet tests in the docs. However, that's no longer possible.
Relates to #79309, #31619
These docs are out of date, now that we override the infinite DNS cache
within Elasticsearch. This commit completely removes this content, as
specific guidance is no longer needed here.
