code: @BetaApi
    public final VpnTunnel getVpnTunnel(String vpnTunnel) {
  
      GetVpnTunnelHttpRequest request =
          GetVpnTunnelHttpRequest.newBuilder().setVpnTunnel(vpnTunnel).build();
      return getVpnTunnel(request);
    }
docs: Returns the specified VpnTunnel resource. Gets a list of available VPN tunnels by making a
  list() request.
  
  <p>Sample code:
  
  <pre><code>
  try (VpnTunnelClient vpnTunnelClient = VpnTunnelClient.create()) {
  ProjectRegionVpnTunnelName vpnTunnel = ProjectRegionVpnTunnelName.of("[PROJECT]", "[REGION]", "[VPN_TUNNEL]");
  VpnTunnel response = vpnTunnelClient.getVpnTunnel(vpnTunnel.toString());
  }
  </code></pre>
  
  @param vpnTunnel Name of the VpnTunnel resource to return.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails