[Backport 2.x] Well format the raw response when query parameter "pretty" enabled

[LantaoJin]

Backport aec4825 from #2727

The backport by opensearch-trigger-bot failed with exit code 128 (Ref: #2727 (comment))

[LantaoJin]

The auto-backport process failed with The process '/usr/bin/git' failed with exit code 128, manually backport it. @penghuo @dai-chen @vamsi-amazon. Only MacOS Build failed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.66%. Comparing base (8856f85) to head (69d73ce).

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #2829      +/-   ##
============================================
+ Coverage     94.65%   94.66%   +0.01%     
- Complexity     5135     5180      +45     
============================================
  Files           509      511       +2     
  Lines         14600    14639      +39     
  Branches        946      944       -2     
============================================
+ Hits          13819    13858      +39     
  Misses          740      740              
  Partials         41       41              

Flag	Coverage Δ
sql-engine	94.66% <100.00%> (+0.01%)	⬆️

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[LantaoJin]

Security IT failed due to https://github.com/opensearch-project/security/actions/runs/9967076404/job/27540175842
Workflows are needed to rerun when above job succeed again.
But all these failures are not related to this PR. This manually backport still needs another approval from maintainers, cc @penghuo @vamsi-amazon, then I will merge it after all workflows passed.

[LantaoJin]

Security ITs now passed with the help from opensearch-project/security#4576