[MD] Fix view single document issue by updating low-level search call param

[zhongnansu]

Signed-off-by: Su szhongna@amazon.com

Description

Add datasource param to low-level search call in Discover, that fixes the rendering issue of single document, while searching against data source

Issues Resolved

Part of #2400, issue reported by @abbyhu2000

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
  • yarn test:ftr
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[ananzh]

@zhongnansu need to update the CHANGELOG.md file to pass the check

[zhongnansu]

@zhongnansu need to update the CHANGELOG.md file to pass the check

Thanks, done. Could you approve again?

[codecov-commenter]

Codecov Report

Merging #2431 (60e096a) into main (746b9df) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2431   +/-   ##
=======================================
  Coverage   66.75%   66.75%           
=======================================
  Files        3200     3200           
  Lines       60886    60886           
  Branches     9250     9250           
=======================================
+ Hits        40642    40646    +4     
+ Misses      18032    18029    -3     
+ Partials     2212     2211    -1     

Impacted Files	Coverage Δ
...cation/components/doc/use_opensearch_doc_search.ts	90.90% <ø> (ø)
packages/osd-optimizer/src/node/cache.ts	52.77% <0.00%> (+2.77%)	⬆️
...s/osd-optimizer/src/node/node_auto_tranpilation.ts	87.75% <0.00%> (+4.08%)	⬆️

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