code: public Observable<DataLakeAnalyticsAccountInner> updateAsync(String resourceGroupName, String accountName, UpdateDataLakeAnalyticsAccountParameters parameters) {
          return updateWithServiceResponseAsync(resourceGroupName, accountName, parameters).map(new Func1<ServiceResponse<DataLakeAnalyticsAccountInner>, DataLakeAnalyticsAccountInner>() {
              @Override
              public DataLakeAnalyticsAccountInner call(ServiceResponse<DataLakeAnalyticsAccountInner> response) {
                  return response.body();
              }
          });
      }
docs: Updates the Data Lake Analytics account object specified by the accountName with the contents of the account object.
  
  @param resourceGroupName The name of the Azure resource group.
  @param accountName The name of the Data Lake Analytics account.
  @param parameters Parameters supplied to the update Data Lake Analytics account operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request