code: private BufferedReader getBulkBufferedReader(int index) throws AsyncApiException {
      return new BufferedReader(new InputStreamReader(
          this.bulkConnection.getQueryResultStream(this.bulkJob.getId(), this.bulkResultIdList.get(index).getBatchId(),
              this.bulkResultIdList.get(index).getResultId()), ConfigurationKeys.DEFAULT_CHARSET_ENCODING));
    }
docs: Get a buffered reader wrapping the query result stream for the result with the specified index
  @param index index the {@link #bulkResultIdList}
  @return a {@link BufferedReader}
  @throws AsyncApiException