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