Release notes for 8.19.8, 9.1.8, 9.2.2

[charlotte-hoblik]

Create release notes for:

• 8.19.8:
  • Search team issue: https://github.com/elastic/search-team/issues/11807
  • Docs team issue: https://github.com/elastic/dev/issues/3378
• 9.1.8:
  • Search team issue: https://github.com/elastic/search-team/issues/11808
  • Docs team issue: https://github.com/elastic/dev/issues/3379
• 9.2.2:
  • Search team issue: https://github.com/elastic/search-team/issues/11806
  • Docs team issue: https://github.com/elastic/dev/issues/3380

Deadline: 2025.12.02

Products:

• Elasticsearch:

  • 8.19.8: Add release notes for v8.19.8 release elasticsearch#138783
  • 9.1.8: Add release notes for v9.1.8 release elasticsearch#138785
  • 9.2.2: Add release notes for v9.2.2 release elasticsearch#138784

• Enterprise search:

  • 8.19.8: https://github.com/elastic/enterprise-search-pubs/pull/4832

• Connectors:

  • 8.19.8: [DOCS]: Add connectors release notes for 8.19.8 elasticsearch#138848
  • 9.1.8: [DOCS]: Add connectors release notes for 9.1.8 and 9.2.2 elasticsearch#138849
  • 9.2.2: [DOCS]: Add connectors release notes for 9.1.8 and 9.2.2 elasticsearch#138849

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• create backports: