**Problem:**
For historical reasons, source files for the Elasticsearch Guide's security, watcher, and Logstash API docs are housed in the `x-pack/docs` directory. This can confuse new contributors who expect Elasticsearch Guide docs to be located in `docs/reference`.
**Solution:**
- Move the security, watcher, and Logstash API doc source files to the `docs/reference` directory
- Update doc snippet tests to use security
Rel: https://github.com/elastic/platform-docs-team/issues/208
* [DOCS] Remote cluster troubleshooting guide
* Fix test failures
* Apply suggestions from code review
Co-authored-by: Yang Wang <ywangd@gmail.com>
* Review feedback
* Group issues under 'common' and 'API key'
* Apply suggestions from code review
Co-authored-by: Yang Wang <ywangd@gmail.com>
---------
Co-authored-by: Yang Wang <ywangd@gmail.com>
* [DOCS] Expand the step that enables the remote cluster server
* Update docs/reference/modules/cluster/remote-clusters-api-key.asciidoc
* Reword
* Reword
* [DOCS] Remote cluster migration guide
* Review feedback
* Clarify that any extra local privileges will be suppressed by the cross-cluster API key’s privileges
* New docs structure for remote clusters
* Fix broken cross-book link errors
* More broken cross-book link errors
* Remove redirects for new pages
* Link to generic remote cluster docs instead
* Drop 'API' from the abbreviated title
* Add 'Establish trust with a remote cluster' section
* Restructure 'Establish trust' section into Prprequisite/local/remote instructions
* Add 'Configure roles and users' section
* Add 'Connect to a remote cluster' section
* Move version compatibility to prerequisites
* Fix test errors
* Incorporate review feedback
* Mention version 8.10 or later in the intro for API keys
* Add license prerequisite
