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Remove orphaned commits from Advanced Search index

John Mason requested to merge jm-delete-orphaned-commits-migration into master

What does this MR do and why?

Closes #327829 (closed)

This migration removes commits that were associated to a project that no longer exists in Advanced Search index.

Because there are currently 56,140,808 orphaned commits, the delete_by_query may take some time, so the timeout is set to 3d. Elasticsearch will internally create batch sizes and execute each of them until all documents that match the query are deleted. Documentation: https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-delete-by-query.html#docs-delete-by-query-api-desc

This migration will run before the commits permissions migration. Otherwise, the commits permissions migration will never think it has fully completed because there are commits that still don't have visibility levels (because they are orphaned).

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

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

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Merge request reports