Remove search_index_all_projects FF

What does this MR do and why?

Related to #432489 (closed)

Removes search_index_all_projects FF and releases the index all projects feature for Advanced search

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

N/A - not a frontend change

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

changed milestone to %16.11

added devopsdata stores feature flag featureenhancement groupglobal search sectioncore platform typefeature workflowverification labels

assigned to @terrichu

added backend label

	1 Message
	This merge request adds or changes documentation files. A review from the Technical Writing team before you merge is recommended. Reviews can happen after you merge.

Documentation review

The following files require a review from a technical writer:

• doc/integration/advanced_search/elasticsearch.md (Link to current live version)

The review does not need to block merging this merge request. See the:

• Metadata for the *.md files that you've changed. The first few lines of each *.md file identify the stage and group most closely associated with your docs change.
• The Technical Writer assigned for that stage and group.
• Documentation workflows for information on when to assign a merge request for review.

Reviewer roulette

Category	Reviewer	Maintainer
backend	@imand3r (UTC-7, 3 hours behind author)	@suraj_tripathy (UTC+5.5, 9.5 hours ahead of author)

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added 1 commit

• 3f3f7580 - Remove search_index_all_projects FF

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added documentation label

changed the description

@ashrafkhamis would you mind a documentation review? The MR in draft because I'm holding off on merging until I finish some verification work, but the documentation updates won't be affected.

requested review from @ashrafkhamis

added Technical Writing label

removed review request for @ashrafkhamis

added docsfeature label

added 1 commit

• 85a4162d - Apply 1 suggestion(s) to 1 file(s)

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requested review from @ashrafkhamis

approved this merge request

added pipeline:mr-approved label

removed review request for @ashrafkhamis

@ashrafkhamis, thanks for approving this merge request.

This is the first time the merge request has been approved. To ensure we don't only run predictive pipelines, and we don't break master, a new pipeline will be started shortly.

Please wait for the pipeline to start before resolving this discussion and set auto-merge for the new pipeline. See merging a merge request for more details.