[Backport 2.x] [MD] Improve test connection

[opensearch-trigger-bot]

Backport 5719fb9 from #3110.

[codecov-commenter]

Codecov Report

Merging #3209 (2c3edfa) into 2.x (ccbd616) will increase coverage by 0.09%.
The diff coverage is 68.75%.

@@            Coverage Diff             @@
##              2.x    #3209      +/-   ##
==========================================
+ Coverage   66.63%   66.73%   +0.09%     
==========================================
  Files        3220     3220              
  Lines       61544    61545       +1     
  Branches     9432     9429       -3     
==========================================
+ Hits        41011    41073      +62     
+ Misses      18287    18226      -61     
  Partials     2246     2246              

Flag	Coverage Δ
Linux	66.68% <68.75%> (+0.04%)	⬆️
Windows	66.68% <68.75%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../data_source_management/public/components/utils.ts	95.65% <0.00%> (-0.19%)	⬇️
...gins/data_source/server/client/configure_client.ts	66.03% <20.00%> (+2.40%)	⬆️
.../plugins/data_source/server/data_source_service.ts	71.42% <100.00%> (ø)
...ta_source/server/legacy/configure_legacy_client.ts	70.83% <100.00%> (+60.41%)	⬆️
src/plugins/data_source/server/lib/error.ts	100.00% <100.00%> (ø)
...s/osd-optimizer/src/node/node_auto_tranpilation.ts	83.67% <0.00%> (-4.09%)	⬇️
packages/osd-optimizer/src/node/cache.ts	51.31% <0.00%> (-1.32%)	⬇️
...ic/application/models/sense_editor/sense_editor.ts	64.88% <0.00%> (+0.88%)	⬆️
src/dev/build/lib/config.ts	85.29% <0.00%> (+5.88%)	⬆️
...ges/osd-apm-config-loader/src/config.test.mocks.ts	100.00% <0.00%> (+8.69%)	⬆️
... and 4 more

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