Elasticsearch, Connectors release notes for 9.0.8, 9.1.5

[charlotte-hoblik]

Create release notes for:

• 9.0.8
  • Search team issue: https://github.com/elastic/search-team/issues/11113
  • Docs team issue: https://github.com/elastic/dev/issues/3313
• 9.1.5
  • Search team issue: https://github.com/elastic/search-team/issues/11123
  • Docs team issue: https://github.com/elastic/dev/issues/3312

Deadline: 2025.08.27

Products:

• Elasticsearch:

  • 9.0.8: Add release notes for v9.0.8 release elasticsearch#135896
  • 9.1.5: Add release notes for v9.1.5 release elasticsearch#135881
    [DOCS] Add security advisory for 9.0.8, 9.1.5 release notes elasticsearch#136020

• Connectors:

  • 9.0.8: [DOCS] Connectors release notes for 9.0.8 elasticsearch#135920
  • 9.1.5: [DOCS] Connectors release notes for 9.1.5 elasticsearch#135921

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• create backports