[Backport 2.15] Error visibility: Modifying error logs and logging more details about errors received from remote service

[opensearch-trigger-bot]

Backport 441af6e from #3337

[dhrubo-os]

> Task :opensearch-ml-algorithms:compileJava
/__w/ml-commons/ml-commons/ml-algorithms/src/main/java/org/opensearch/ml/engine/httpclient/MLHttpClientFactory.java:28: warning: [removal] AccessController in java.security has been deprecated and marked for removal
            return AccessController
                   ^
/__w/ml-commons/ml-commons/ml-algorithms/src/main/java/org/opensearch/ml/engine/tools/SearchIndexTool.java:119: warning: [removal] AccessController in java.security has been deprecated and marked for removal
                        String doc = AccessController.doPrivileged((PrivilegedExceptionAction<String>) () -> {
                                     ^
/__w/ml-commons/ml-commons/ml-algorithms/src/main/java/org/opensearch/ml/engine/algorithms/remote/MLSdkAsyncHttpResponseHandler.java:174: error: cannot find symbol
            log.error("Remote server returned exception with status code: {} and body: {}", statusCode, body);
                                                                                                        ^
  symbol:   variable body
  location: class MLSdkAsyncHttpResponseHandler
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.

> Task :opensearch-ml-algorithms:compileJava FAILED
Note: Recompile with -Xlint:unchecked for details.
> Task :opensearch-ml-common:generateTestEffectiveLombokConfig
1 error
7 warnings