private static Result.ResultType messageBusErrorToResultType(int messageBusError) {
        switch (messageBusError) {
            case ErrorCode.SEND_QUEUE_FULL: return Result.ResultType.TRANSIENT_ERROR;
            default: return Result.ResultType.FATAL_ERROR;
        }
    }
Returns a concatenated error string from the errors contained in a reply.

@param reply The reply whose errors to concatenate.
@return The error string.
documentapi/src/main/java/com/yahoo/documentapi/messagebus/MessageBusAsyncSession.java