Ensure snippet STI subclasses to share the same `snippet` type,
to fix admin not ablet to find any snippet due to type being
`project_snippet`.

Filter non-admin search also by type so other models won't be searched
by accident in the future.

e.g. delegating delete_index! to 2 targets doesn't make sense.

Related spec is passing in:
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/13917/
because now the configuration is stored in the centralized `Config`,
which is then used during initialization of `ApplicationClassProxy`.
No dynamic inheritance is involved, so bug is bypassed.

Callbacks are copied from elasticsearch_rails

Move logic into class and instance proxies

Alias latest version as V12_1
The benefit is we can have a continuous git log on `Latest`,
making diff’ing changes easier.

Spec Snippet indexing and searching

Copied from ApplicationSearch

Ensure various `client` method always provide up-to-date client

We no longer include Elasticsearch::Model, which would set up
those included modules. Therefore we have to do this manually.

Allow __transform to handle versions

Quarantine failing test

See merge request gitlab-org/gitlab-ee!15095

Fix broken master: Update karma for new expansion cell markup

Closes gitlab-ee#13439

See merge request gitlab-org/gitlab-ce!31694

Also cleans up spec by:
- Add missing `afterEach ... $destroy`
- Add missing `done` call when `$nextTick` was used

Make clearer that memory team is working to reduce memory requirement

See merge request gitlab-org/gitlab-ce!31647

Make clearer that the memory team is working
to reduce the memory requirement

Regenerate locale.pot

See merge request gitlab-org/gitlab-ee!15090

Update ffi gem to 1.11.1

See merge request gitlab-org/gitlab-ce!31686

This reduces duplication on Omnibus GitLab and saves about ~8 MB of disk
space.

Full list of changes:
https://github.com/ffi/ffi/blob/master/CHANGELOG.md

Backport of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14943

See merge request gitlab-org/gitlab-ce!31406

Resolve "Geo: Log cursor can take up to 60 secs to exit"

Closes #13411

See merge request gitlab-org/gitlab-ee!15070

Resolve "Incrementally expand merge request diffs in both direction"

Closes #58035

See merge request gitlab-org/gitlab-ce!30927

- expand upwards
- expand downwards
- expand all

in both inline and parallel views

End-to-end test for Issues Analytics Premium feature

Closes gitlab-org/quality/testcases#82

See merge request gitlab-org/gitlab-ee!15084

Split MR widget into etag-cached and non-cached serializers

See merge request gitlab-org/gitlab-ce!31354

Splits auto-refreshing of MR widget into 2 requests:

- the one which uses etag-caching and invalidates the fields on change
- the one without caching

The idea is to gradually move all the fields to etag-cached endpoint

Split MR widget into cached and non-cached serializers

See merge request gitlab-org/gitlab-ee!15045

Splits auto-refreshing of MR widget into 2 requests:

- the one which uses etag-caching and invalidates the fields on change
- the one without caching

The idea is to gradually move all the fields to etag-cached endpoint

Backport EE code for OAuth applications spec

See merge request gitlab-org/gitlab-ce!31670

Prevent rewritting plain links as embedded

Closes #58494

See merge request gitlab-org/gitlab-ce!31489