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