code: private void logResponseRequestId(final String awsRequestId) {
          if (requestIdLog.isDebugEnabled() || requestLog.isDebugEnabled()) {
              final String msg = "AWS Request ID: " +
                                 (awsRequestId == null ? "not available" : awsRequestId);
              if (requestIdLog.isDebugEnabled()) {
                  requestIdLog.debug(msg);
              } else {
                  requestLog.debug(msg);
              }
          }
      }
docs: Used to log the request id (extracted from the response) at DEBUG level. This method is
  called only if there is no request id present in the httpClientSettings response header. The
  request id is logged using the "com.amazonaws.requestId" logger if it was enabled at DEBUG
  level; otherwise, it is logged using at DEBUG level using the "com.amazonaws.request"
  logger.