[DOCS] Adds scope to monitoring

[lcawl]

Fixes #57217

Related to elastic/beats#18547

This PR also switches the instructions in https://www.elastic.co/guide/en/elasticsearch/reference/master/configuring-metricbeat.html so that it matches https://www.elastic.co/guide/en/beats/metricbeat/master/metricbeat-module-elasticsearch.html
and recommends the Elasticsearch module instead of the Elasticsearch X-Pack module.

Preview

https://elasticsearch_57852.docs-preview.app.elstc.co/guide/en/elasticsearch/reference/master/configuring-metricbeat.html

[elasticmachine]

Pinging @elastic/es-core-features (:Core/Features/Monitoring)

[elasticmachine]

Pinging @elastic/es-docs (>docs)

[ycombinator]

Thanks for the PR. I think we should keep the original step 3 as is, the one in which we ask users to enable the Elasticsearch X-Pack module.

Also, we can just remove step 4 in master and 7.x, as enabling the Elasticsearch X-Pack module now auto-enables the appropriate metricsets (starting from 7.8.0; see elastic/beats#17609).

[lcawl]

I think we should keep the original step 3 as is, the one in which we ask users to enable the Elasticsearch X-Pack module.

Thanks for the feedback! I've reverted to the use of the Elasticsearch X-Pack module but have added a link for the alternative method.

Also, we can just remove step 4

I've left it in to show the placement of the scope attribute, but have removed the metricsets to align with what I see in my 7.8 tests. I've also added callouts to the example so it's a bit clearer.

[ycombinator]

LGTM. Sorry for the delay!