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

[opensearch-trigger-bot]

Backport 75df251 from #2973.

[codecov-commenter]

Codecov Report

Merging #3067 (28a4bd1) into 2.x (0a92e60) will decrease coverage by 0.04%.
The diff coverage is 68.65%.

@@            Coverage Diff             @@
##              2.x    #3067      +/-   ##
==========================================
- Coverage   66.67%   66.63%   -0.05%     
==========================================
  Files        3219     3219              
  Lines       61450    61504      +54     
  Branches     9417     9430      +13     
==========================================
+ Hits        40971    40981      +10     
- Misses      18232    18279      +47     
+ Partials     2247     2244       -3     

Flag	Coverage Δ
Linux	66.63% <68.65%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
...c/plugins/data_source/server/client/client_pool.ts	58.82% <ø> (ø)
...gins/data_source/server/client/configure_client.ts	63.63% <31.81%> (-23.55%)	⬇️
.../plugins/data_source/server/data_source_service.ts	71.42% <66.66%> (-3.58%)	⬇️
...ents/edit_data_source/components/header/header.tsx	93.75% <75.00%> (-6.25%)	⬇️
.../data_source_management/public/components/utils.ts	95.83% <75.00%> (-4.17%)	⬇️
...components/create_form/create_data_source_form.tsx	96.96% <83.33%> (-1.40%)	⬇️
...rce/components/edit_form/edit_data_source_form.tsx	90.76% <86.66%> (-0.69%)	⬇️
...e_data_source_wizard/create_data_source_wizard.tsx	97.50% <100.00%> (+0.72%)	⬆️
...c/components/edit_data_source/edit_data_source.tsx	88.23% <100.00%> (+0.48%)	⬆️
...ta_source/server/legacy/configure_legacy_client.ts	10.41% <0.00%> (-60.42%)	⬇️
... and 3 more

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