code: public ApplicationGatewayInner updateTags(String resourceGroupName, String applicationGatewayName) {
          return updateTagsWithServiceResponseAsync(resourceGroupName, applicationGatewayName).toBlocking().last().body();
      }
docs: Updates the specified application gateway tags.
  
  @param resourceGroupName The name of the resource group.
  @param applicationGatewayName The name of the application gateway.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the ApplicationGatewayInner object if successful.