[BUG] Data Source Connection Validation Fails on OpenSearchServlerless Even When Response is 200 OK But With An Empty Response Body

[cliu123]

Describe the bug

A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Dashboards Management' > 'Data Sources'
2. Create a data source connecting OpenSearchServerless collections where there is no indices.
3. Click on 'Test connection'
4. See error in browser 'Inspect' > 'Network'
   

Expected behavior
Data source connects OpenSearchServerless collections successfully.

Dashboards Version
2.13

Host/Environment (please complete the following information):

• OS: [e.g. iOS] MacOS
• Browser and version [e.g. 22] Google Chrome

Additional context
This issue is related to #5707 (comment).

[cliu123]

@opensearch-project/engineering-effectiveness @opensearch-project/opensearch-dashboards-core Could we include the fix in 2.13.1?
Cc: @seraphjiang

[seraphjiang]

@bbarani @gaiksaya would you help ?

[bbarani]

@cliu123 @seraphjiang We are not planning to release 2.13.1 at this time. You can merge the bug fix in 2.13 release branch and it will be included in 2.13.1 if we end up releasing it.

[BionIT]

@cliu123 Looks like attached PRs have been merged, and the backport is merged as well, are we good to close this issue?