CE Upstream - Wednesday

Closes gitlab-ce#29425, gitlab-ce#29084, gitlab-ce#19742, and gitlab-qa#30

See merge request !1427

Do not add EE license if not set in GitLab QA tests

See merge request !1459

Fix searches within a group when using elasticsearch

Closes #1899

See merge request !1423

Merge remote-tracking branch 'origin/all-ci-offline-migrations'

See merge request !1451

Get Geo secondaries nodes statuses over AJAX

See merge request !1438

Removes issue milestone when removing from board with milestone

Closes gitlab-ce#29613

See merge request !1446

See bb0cba92Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Don't try to create the index if it already exist. It's possible that a
previous rollback did not remove the index since the index is not
dropped on MySQL because MySQL would also drop the foreign key in that
case, see f67d8eb1.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/29613

Load balancing of database queries

See merge request !1283

Strip out `nil`s in the Array of Commit objects returned from `find_commits_by_message_with_elastic`

Closes #835

See merge request !1430

Port of issue boards filter bar in modal window to EE

See merge request !1435

Expose GitLab QA failure screenshots for EE hooks

See merge request !1440

Strip out `nil`s in the Array of Commit objects returned from `find_commits_by_message_with_elastic`

This commit also removes an N-query issue with the Project lookups on the class-level version of this method

Port of 27376-cache-default-branch-pipeline-on-project to EE

See merge request !1441

Add docs to CSV export

See merge request !1389