[Java] User's Exception's metadata thrown by method FlightServerMiddleware.onCallStarted() getting override and set to empty value

[PANKAJ9768]

Describe the bug, including details regarding any error messages, version, and platform.

In flight producer , User is throwing StatusRuntimeException having metadata with custom error message from the implementation class of FlightServerMiddleware.onCallStarted ,
eg:
Metadata trailers=new Metadata(); trailers.put(Metadata.key.of("custom_msg",Metadata.ASCII_STRING_MARSHALLER),"custom error msg"); throw StatusUtils.fromGrpcRuntimeException(new StatusRuntimeException(Status.UNAUTHENTICATED,trailers) );
But this is getting override in in catch block of ServerInterceptorAdapter.interceptCall ,

Because of this at flight client side user is not able to propagate meaning error message , Only correct status is received at client side .

Expectation :
Metadata from FlightRuntimeException should be used while closing the call .
ServerInterceptorAdapter.interceptCall
call.close(StatusUtils.toGrpcStatus(e.status()), e.status().metadata());

Component(s)

FlightRPC, Java