docs: public CreateClientVpnEndpointRequest withAuthenticationOptions(ClientVpnAuthenticationRequest... authenticationOptions) {
          if (this.authenticationOptions == null) {
              setAuthenticationOptions(new com.amazonaws.internal.SdkInternalList<ClientVpnAuthenticationRequest>(authenticationOptions.length));
          }
          for (ClientVpnAuthenticationRequest ele : authenticationOptions) {
              this.authenticationOptions.add(ele);
          }
          return this;
      }