The introduction of advanced search syntax allowed queries like `-foo`. These
break our repository queries in two distinct ways:

* Blobs would be returned for commit queries, and vice-versa
* Highlighting was assumed to be present for all queries

The first is fixed by adding explicit type terms to the queries:

    { term: { 'commit.type' => 'commit' } }
    { term: { 'blob.type' => 'blob' } }

(The `_type` field is, of course, `repository` for both document kinds).

A query matched by a negative search will not have any highlighting results,
so we also need to make processing that conditional.

Finally, switch commit search to `default_operator: :and` so it behaves more
like the rest of the application.

Switching to `default_operator: :and` should be enough to keep this from
happening.

Resolve "Export issue time tracking information"

Closes #1406

See merge request !2627

Document how to use AWS IAM profiles for object storage

See merge request !2708

Tuesday: CE upstream

Closes #3178, #2750, gitaly#404, and gitlab-ce#27390

See merge request !2683

[ci skip]

Move workflow/importing/ to user/project/import/

See merge request !2694

Fixed issue boards focus mode not being visible to guest users

Closes #3182

See merge request !2699

Fix LDAP backwards compatibility

Closes gitlab-ce#36432 and #3082

See merge request !2690

Closes #3182

Fix pipeline quota text not collapsing in the new sidebar

See merge request !2697

Create system notes only if issue was successfully related to another

Closes gitlab-ce#36443

See merge request !2684

Repo editor with flex layout -- EE merge edition

See merge request !2700

Improves handling of the mirror threshold

Closes #3134

See merge request !2671

* Fix when method is defined but encryption is not
* Fix when verify_certificates is not defined

Add metrics for BitBucket and GitHub API calls

See merge request !2661

Improves handling of stuck projects

Closes #3108

See merge request !2628

Support handling of rename events in Geo Log Cursor

See merge request !2615

Use rugged_is_ancestor? instead of Gitaly when it is called inside a loop

Closes gitlab-com/infrastructure#2138

See merge request !2696

Port of dispatcher-race-condition-fix to EE

See merge request !2643

[EE] Whitelist or fix additional `Gitlab/PublicSend` cop violations

See merge request !2662

Remove ignore column lines

See merge request !2677

[EE] Enable Layout/TrailingWhitespace cop and auto-correct offenses

See merge request !2686

Fix time travelling tests.

See merge request !2691

Fix Copy to Clipboard for SSH Public Key on Pull Repository settings

Closes #3167

See merge request !2692