Elasticsearch, Enterprisesearch, Connectors release notes for 8.18.8, 8.19.5

[charlotte-hoblik]

Create release notes for:

• 8.18.8
  • Search team issue:
  • Docs team issue: https://github.com/elastic/dev/issues/3314
• 8.19.5
  • Search team issue: https://github.com/elastic/search-team/issues/11076
  • Docs team issue: https://github.com/elastic/dev/issues/3311

Deadline: 2025.08.27

Products:

• Enterprise search:

  • 8.18.8: https://github.com/elastic/enterprise-search-pubs/pull/4827
  • 8.19.5: https://github.com/elastic/enterprise-search-pubs/pull/4826

• Elasticsearch:

  • 8.18.8: Add release notes for v8.18.8 release elasticsearch#135894
  • 8.19.5: Add release notes for v8.19.5 release elasticsearch#135882
    [DOCS] Add security advisory for 8.18.8 release notes elasticsearch#136018
    [DOCS] Add security advisory for 8.19.5 release notes elasticsearch#136019

• Connectors:

  • 8.18.8: [DOCS] Connectors release notes for 8.18.8 elasticsearch#135916
  • 8.19.5: [DOCS] Connectors release notes for 8.19.5 elasticsearch#135918

---

• create backports
  https://github.com/elastic/enterprise-search-pubs/pull/4828
  [DOCS][Backport] Add 8.18.8 release notes elasticsearch#136088