message: Solves Issue
  Missing file_index characteristic in BP1Writer metadata
diff: @@ -276,6 +276,10 @@ void BP1Writer::WriteVariableCharacteristics(
  WriteCharacteristicRecord(characteristic_time_index, characteristicsCounter,
  stats.TimeIndex, buffer);
  + WriteCharacteristicRecord(characteristic_file_index, characteristicsCounter,
  + static_cast<uint32_t>(m_BP1Aggregator.m_RankMPI),
  + buffer);
  +
  WriteCharacteristicRecord(characteristic_offset, characteristicsCounter,
  stats.Offset, buffer);
  