Fixed exception when datasource is updated with existing configuration.

[vamsi-amazon]

Description

In the current state when datasource is updated with existing configuration, it results in 503 error.
With this PR, it returns 200.

Issues Resolved

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Merging #2006 (4353a32) into main (6055c7e) will increase coverage by 0.00%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #2006   +/-   ##
=========================================
  Coverage     97.30%   97.30%           
- Complexity     4622     4623    +1     
=========================================
  Files           407      407           
  Lines         11934    11935    +1     
  Branches        827      828    +1     
=========================================
+ Hits          11612    11613    +1     
  Misses          315      315           
  Partials          7        7           

Flag	Coverage Δ
sql-engine	97.30% <100.00%> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
...s/storage/OpenSearchDataSourceMetadataStorage.java	98.75% <100.00%> (+<0.01%)	⬆️