Release notes for 8.18.7, 8.19.4, 9.0.7, 9.1.4

[charlotte-hoblik]

Create release notes for:

• 8.18.7
  • Search team issue: https://github.com/elastic/search-team/issues/10908
  • Docs team issue: https://github.com/elastic/dev/issues/3279
• 8.19.4
  • Search team issue: https://github.com/elastic/search-team/issues/10904
  • Docs team issue: https://github.com/elastic/dev/issues/3280
• 9.0.7
  • Search team issue: https://github.com/elastic/search-team/issues/10905
  • Docs team issue: https://github.com/elastic/dev/issues/3281
• 9.1.4
  • Search team issue: https://github.com/elastic/search-team/issues/10906
  • Docs team issue: https://github.com/elastic/dev/issues/3282

Deadline: 2025.09.

Products:

• Elasticsearch:

  • 8.18.7: Add release notes for v8.18.7 release elasticsearch#134686
  • 8.19.4: Add release notes for v8.19.4 release elasticsearch#134685
  • 9.0.7: Add release notes for v9.0.7 release elasticsearch#134683
  • 9.1.4: Add release notes for v9.1.4 release elasticsearch#134684

• Enterprise search:

  • 8.18.7: https://github.com/elastic/enterprise-search-pubs/pull/4823
  • 8.19.4: https://github.com/elastic/enterprise-search-pubs/pull/4824

• Connectors:

  • 8.18.7:
  • 8.19.4:
  • 9.0.7:
  • 9.1.4:

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• create backports