[Request] [Detection Engine][Serverless] Expose ES|QL rule in serverless

[yctercero]

Description

With ES|QL becoming available in serverless, we can now move to remove the feature flag hiding it in serverless.

Background & resources

• PRs: TBD
• Issues/metas: https://github.com/elastic/kibana/issues/181937
• Point of contact: @yctercero
• Test environments: TBD

Which documentation set does this change impact?

Serverless only

ESS release

N/A

Serverless release

The week of May 13th

Feature differences

NA

API docs impact

Need to expose same docs that exist for ES|QL rule in ESS, in serverless.

Prerequisites, privileges, feature flags

Removing existing feature flag.

[nastasha-solomon]

Notes from meeting with @yctercero today:

• Dev is targeting the Monday, May 13, 2024 Serverless release, so docs will need to be ready for publishing by then.
• There's no need to update Servlers API docs for the ES|QL rule as Security API docs are not exposed/hosted on the Serverless docsite.
• @nastasha-solomon to do the following:
  • [x] Add the following content to the Serverless docs:
    • [x] ES|QL rule type
    • [x] Create an ES|QL rule
  • [x] Figure out whether the ES|QL rule docs should reference ES|QL reference content in Servlerss (which doesn't currently exist) or ES|QL content in the ESS docset. Will ping the ES writers to learn more.

[nastasha-solomon]

PR merged