[7.x](backport #27549) [Metricbeat] Enterprise Search Module

[mergify]

This is an automatic backport of pull request #27549 done by Mergify.
Cherry-pick of 3c77c9a has failed:

On branch mergify/bp/7.x/pr-27549
Your branch is up to date with 'origin/7.x'.

You are currently cherry-picking commit 3c77c9a92a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   CHANGELOG.next.asciidoc
	new file:   metricbeat/docs/modules/enterprisesearch.asciidoc
	new file:   metricbeat/docs/modules/enterprisesearch/health.asciidoc
	new file:   metricbeat/docs/modules/enterprisesearch/stats.asciidoc
	modified:   metricbeat/docs/modules_list.asciidoc
	modified:   x-pack/metricbeat/include/list.go
	modified:   x-pack/metricbeat/metricbeat.reference.yml
	new file:   x-pack/metricbeat/module/enterprisesearch/_meta/Dockerfile
	new file:   x-pack/metricbeat/module/enterprisesearch/_meta/config.yml
	new file:   x-pack/metricbeat/module/enterprisesearch/_meta/docker-entrypoint-dependencies.sh
	new file:   x-pack/metricbeat/module/enterprisesearch/_meta/docs.asciidoc
	new file:   x-pack/metricbeat/module/enterprisesearch/_meta/fields.yml
	new file:   x-pack/metricbeat/module/enterprisesearch/_meta/kibana/7/dashboard/Metricbeat-enterprise-search.json
	new file:   x-pack/metricbeat/module/enterprisesearch/doc.go
	new file:   x-pack/metricbeat/module/enterprisesearch/docker-compose.yml
	new file:   x-pack/metricbeat/module/enterprisesearch/fields.go
	new file:   x-pack/metricbeat/module/enterprisesearch/health/_meta/docs.asciidoc
	new file:   x-pack/metricbeat/module/enterprisesearch/health/_meta/fields.yml
	new file:   x-pack/metricbeat/module/enterprisesearch/health/_meta/testdata/config.yml
	new file:   x-pack/metricbeat/module/enterprisesearch/health/_meta/testdata/health.json
	new file:   x-pack/metricbeat/module/enterprisesearch/health/_meta/testdata/health.json-expected.json
	new file:   x-pack/metricbeat/module/enterprisesearch/health/data.go
	new file:   x-pack/metricbeat/module/enterprisesearch/health/data_test.go
	new file:   x-pack/metricbeat/module/enterprisesearch/health/health.go
	new file:   x-pack/metricbeat/module/enterprisesearch/health/health_integration_test.go
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/_meta/docs.asciidoc
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/_meta/fields.yml
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/_meta/testdata/config.yml
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/_meta/testdata/stats.json
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/_meta/testdata/stats.json-expected.json
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/data.go
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/data_test.go
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/stats.go
	new file:   x-pack/metricbeat/module/enterprisesearch/stats/stats_integration_test.go
	new file:   x-pack/metricbeat/module/enterprisesearch/test_enterprisesearch.py
	modified:   x-pack/metricbeat/module/prometheus/collector/_meta/data.json
	new file:   x-pack/metricbeat/modules.d/enterprisesearch.yml.disabled

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   metricbeat/docs/fields.asciidoc

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[kovyrin]

@Mergifyio refresh

[mergify]

Command refresh: success

Pull request refreshed

[kovyrin]

@Mergifyio update

[mergify]

Command update: success

Branch has been successfully updated

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• Start Time: 2021-10-01T15:38:32.383+0000

• Duration: 100 min 6 sec

• Commit: 5339f25

Test stats 🧪

Test	Results
Failed	0
Passed	9864
Skipped	2468
Total	12332

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[kovyrin]

I pulled this PR, ran make update on metricbeat and checked in the updated files.

[kovyrin]

I have no idea what is going on here with those linting checks. I ran make fmt, make update and make check commands both in x-pack and main metricbeat directories and I do not see any updates locally. Need someone from the @elastic/beats team to take a look at this and advise on why CI thinks something needs updating.

[kovyrin]

Spent an hour digging through the issue and what I can see is that the linux/memory metricset is not getting registered at all. Its Init is never called (while I see other metricsets registering as expected). On the master branch I see the Init being called on the linux/memory metricset as expected. I'm not sure what it means, but something seems to be messed up.

[kovyrin]

I know what it is! #27381 was never backported to 7.x :-(