code: public Observable<NetworkWatcherInner> createOrUpdateAsync(String resourceGroupName, String networkWatcherName, NetworkWatcherInner parameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, networkWatcherName, parameters).map(new Func1<ServiceResponse<NetworkWatcherInner>, NetworkWatcherInner>() {
              @Override
              public NetworkWatcherInner call(ServiceResponse<NetworkWatcherInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates or updates a network watcher in the specified resource group.
  
  @param resourceGroupName The name of the resource group.
  @param networkWatcherName The name of the network watcher.
  @param parameters Parameters that define the network watcher resource.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the NetworkWatcherInner object