[Backport 2.x] add 2.17 release notes

[opensearch-trigger-bot]

Backport 12fd1b2 from #868

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.40%. Comparing base (437b0ed) to head (cbf83cb).
Report is 44 commits behind head on 2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.x     #869      +/-   ##
==========================================
+ Coverage   50.31%   52.40%   +2.09%     
==========================================
  Files         166      168       +2     
  Lines        5595     6541     +946     
  Branches     1075     1336     +261     
==========================================
+ Hits         2815     3428     +613     
- Misses       2508     2716     +208     
- Partials      272      397     +125     

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