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