This merge is needed because of a race between FOSS merge on canonical
and security.

Details on https://gitlab.com/gitlab-org/release-tools/issues/358

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Trigger Elasticsearch indexing when public group moved to private

See merge request gitlab/gitlabhq!3577

This fixes https://gitlab.com/gitlab-org/gitlab/issues/37766 which is
caused by the fact that we leave the stale permissions data in the index
after a group is moved to another group.

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