Update Elasticsearch guide

See merge request !1292

CE Upstream - Wednesday

Closes #1765

See merge request !1281

Remove deprecated upvotes and downvotes from the notes API

See merge request !1275

Re-compile merge request Vue app after jQuery ajax

Closes gitlab-ce#27134

See merge request !1264

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

Add version requirements for Elasticsearch

See merge request !1291

[ci skip]

No more and/or in EE

See merge request !1284

Remove Pages readme

See merge request !1289

To prevent a redirect loop in docs.gitlab.com/ce/pages/

[ci skip]

Change Pages redirect

See merge request !1288

[ci skip]

# Conflicts:
#   doc/api/v3_to_v4.md

Add GitLab Pages guides

See merge request !1286