code: public Observable<Void> addDataLakeStoreAccountAsync(String resourceGroupName, String accountName, String dataLakeStoreAccountName, AddDataLakeStoreParameters parameters) {
          return addDataLakeStoreAccountWithServiceResponseAsync(resourceGroupName, accountName, dataLakeStoreAccountName, parameters).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Updates the specified Data Lake Analytics account to include the additional Data Lake Store account.
  
  @param resourceGroupName The name of the Azure resource group that contains the Data Lake Analytics account.
  @param accountName The name of the Data Lake Analytics account to which to add the Data Lake Store account.
  @param dataLakeStoreAccountName The name of the Data Lake Store account to add.
  @param parameters The details of the Data Lake Store account.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.