[9.x] Fully remove Enterprise Search from Metricbeat

[markjhoy]

As Enterprise Search will no longer be in 9.x, this PR removes the Enterprise Search module from Metricbeat.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Disruptive User Impact

The Enterprise Search module will be removed for 9.x. As Enterprise Search is not in the 9.x stack, no disruptions may happen, however it is noteworthy to call this out.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @markjhoy? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[consulthys]

@markjhoy in this function "ent-search" also needs to be removed from the indexProductNames array

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b markjhoy/remove_ent_search_metricbeat_module upstream/markjhoy/remove_ent_search_metricbeat_module
git merge upstream/main
git push upstream markjhoy/remove_ent_search_metricbeat_module

[leehinman]

LGTM for the data-plane parts

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)