Release notes for 8.19.7, 9.1.7, 9.2.1

[charlotte-hoblik]

Create release notes for:

• 8.19.7:
  • Search team issue: https://github.com/elastic/search-team/issues/11620
  • Docs team issue: https://github.com/elastic/dev/issues/3361
• 9.1.7:
  • Search team issue: https://github.com/elastic/search-team/issues/11612
  • Docs team issue: https://github.com/elastic/dev/issues/3360
• 9.2.1:
  • Search team issue: https://github.com/elastic/search-team/issues/11616
  • Docs team issue: https://github.com/elastic/dev/issues/3359

Deadline: 2025.11.11

Products:

• Elasticsearch:

  • 8.19.7: Add release notes for v8.19.7 release elasticsearch#137835
  • 9.1.7: Add release notes for v9.1.7 release elasticsearch#137836
  • 9.2.1: Add release notes for v9.2.1 release elasticsearch#137834

• Enterprise search:

  • 8.19.7: https://github.com/elastic/enterprise-search-pubs/pull/4830

• Connectors:

  • 8.19.7: Add connector release notes 8.19.7 elasticsearch#137799
  • 9.1.7: [DOCS] Add release notes for search connectors 9.1.7 and 9.2.1 elasticsearch#137800
  • 9.2.1: [DOCS] Add release notes for search connectors 9.1.7 and 9.2.1 elasticsearch#137800

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• create backports