code: public Observable<Page<DataLakeStoreAccountInformationInner>> listByAccountAsync(final String resourceGroupName, final String accountName) {
          return listByAccountWithServiceResponseAsync(resourceGroupName, accountName)
              .map(new Func1<ServiceResponse<Page<DataLakeStoreAccountInformationInner>>, Page<DataLakeStoreAccountInformationInner>>() {
                  @Override
                  public Page<DataLakeStoreAccountInformationInner> call(ServiceResponse<Page<DataLakeStoreAccountInformationInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets the first page of Data Lake Store accounts linked to the specified Data Lake Analytics account. The response includes a link to the next page, if any.
  
  @param resourceGroupName The name of the Azure resource group.
  @param accountName The name of the Data Lake Analytics account.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;DataLakeStoreAccountInformationInner&gt; object