code: public Observable<Page<VaultInner>> listBySubscriptionAsync(final Integer top) {
          return listBySubscriptionWithServiceResponseAsync(top)
              .map(new Func1<ServiceResponse<Page<VaultInner>>, Page<VaultInner>>() {
                  @Override
                  public Page<VaultInner> call(ServiceResponse<Page<VaultInner>> response) {
                      return response.body();
                  }
              });
      }
docs: The List operation gets information about the vaults associated with the subscription.
  
  @param top Maximum number of results to return.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;VaultInner&gt; object