docs: public Observable<Page<AssetFilterInner>> listNextAsync(final String nextPageLink) {
          return listNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<AssetFilterInner>>, Page<AssetFilterInner>>() {
                  @Override
                  public Page<AssetFilterInner> call(ServiceResponse<Page<AssetFilterInner>> response) {
                      return response.body();
                  }
              });
      }