Ref: #34558 (closed)
!18459 (merged) added a join relation on project snippets to support searching public/internal projects.
Since this requires recreating the index this broke indexing on existing indices, so we decided to revert this change for now.
We're keeping most of the changes from the original MR since it also refactored the ES snippet classes to align with the other models.
We plan to revert these changes again at a later date, this is tracked in #35760 (closed).
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines: