docs: @BetaApi
    public final TargetVpnGateway getTargetVpnGateway(String targetVpnGateway) {
  
      GetTargetVpnGatewayHttpRequest request =
          GetTargetVpnGatewayHttpRequest.newBuilder().setTargetVpnGateway(targetVpnGateway).build();
      return getTargetVpnGateway(request);
    }