code: public Observable<Page<FeatureResultInner>> listAsync() {
          return listWithServiceResponseAsync()
              .map(new Func1<ServiceResponse<Page<FeatureResultInner>>, Page<FeatureResultInner>>() {
                  @Override
                  public Page<FeatureResultInner> call(ServiceResponse<Page<FeatureResultInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets all the preview features that are available through AFEC for the subscription.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;FeatureResultInner&gt; object