code: public Observable<Page<OpenShiftManagedClusterInner>> listByResourceGroupNextAsync(final String nextPageLink) {
          return listByResourceGroupNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<OpenShiftManagedClusterInner>>, Page<OpenShiftManagedClusterInner>>() {
                  @Override
                  public Page<OpenShiftManagedClusterInner> call(ServiceResponse<Page<OpenShiftManagedClusterInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Lists OpenShift managed clusters in the specified subscription and resource group.
  Lists OpenShift managed clusters in the specified subscription and resource group. The operation returns properties of each OpenShift managed cluster.
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;OpenShiftManagedClusterInner&gt; object