code: func newNATSTransport(id string, conn *nats.Conn, timeout time.Duration, logOutput io.Writer) (*raft.NetworkTransport, error) {
  	if logOutput == nil {
  		logOutput = os.Stderr
  	}
  	return newNATSTransportWithLogger(id, conn, timeout, log.New(logOutput, "", log.LstdFlags))
  }
docs: // newNATSTransport creates a new raft.NetworkTransport implemented with NATS
  // as the transport layer.