code: public Observable<VpnSiteInner> updateTagsAsync(String resourceGroupName, String vpnSiteName, Map<String, String> tags) {
          return updateTagsWithServiceResponseAsync(resourceGroupName, vpnSiteName, tags).map(new Func1<ServiceResponse<VpnSiteInner>, VpnSiteInner>() {
              @Override
              public VpnSiteInner call(ServiceResponse<VpnSiteInner> response) {
                  return response.body();
              }
          });
      }
docs: Updates VpnSite tags.
  
  @param resourceGroupName The resource group name of the VpnSite.
  @param vpnSiteName The name of the VpnSite being updated.
  @param tags Resource tags.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request