[BUG] Java client unable to get the HTTP response code from a ResponseException

[dd00f]

What is the bug?
Our OpenSearch HTTP Client needs to see the HTTP Response code from OpenSearch to handle various failure scenarios. However, the class : org.opensearch.client.transport.httpclient5.Response is package private, preventing clients from accessing all the details it stores

How can one reproduce the bug?
Steps to reproduce the behavior:

• Make a call to openSearch using org.opensearch.client:opensearch-java:2.8.0 client
• Simulate an internal server error on Open Search that returns a HTTP 500 error code.
• Try to access the error code from the HTTP response, notice how no fields are accessible in the class

What is the expected behavior?
Make org.opensearch.client.transport.httpclient5.Response public so that clients may read details about the error response.

What is your host/environment?

• OS: any
• Version : any
• Plugins : Not applicable

Do you have any screenshots?
Not applicable

Do you have any additional context?
Here is the sample response we received from one of our systems :

Caused by: org.opensearch.client.transport.httpclient5.ResponseException: method [POST], host [https://localhost:9200], URI [/my-query-alias/_search?typed_keys=true&request_cache=false], status line [HTTP/1.1 500 Internal Server Error]
{"error":{"root_cause":[{"type":"security_exception","reason":"Unexpected exception indices:data/read/search"}],"type":"security_exception","reason":"Unexpected exception indices:data/read/search"},"status":500}