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