Release notes for 8.19.18, 9.3.7, 9.4.3

[charlotte-hoblik]

Create release notes for:

• 8.19.18:
  • Search team issue: TODO: not found (8.x releases may not have a search-team issue)
  • Docs team issue: https://github.com/elastic/dev/issues/3556
• 9.3.7:
  • Search team issue: https://github.com/elastic/search-team/issues/15034
  • Docs team issue: https://github.com/elastic/dev/issues/3557
• 9.4.3:
  • Search team issue: https://github.com/elastic/search-team/issues/14674
  • Docs team issue: https://github.com/elastic/dev/issues/3548

Products:

• Elasticsearch:

  • 8.19.18: TODO: PR not generated yet
  • 9.3.7: Add release notes for v9.3.7 release elasticsearch#152235
  • 9.4.3: Add release notes for v9.4.3 release elasticsearch#151690

• Enterprise search:

  • 8.19.18: https://github.com/elastic/enterprise-search-pubs/pull/4844

• Connectors:

  • 8.19.18: elastic/elasticsearch@746d63a
  • 9.3.7: Add release notes for 9.3.7 and 9.4.3 elasticsearch#152282
  • 9.4.3: Add release notes for 9.3.7 and 9.4.3 elasticsearch#152282

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