@Override
  public void setRecordHandler(@NotNull PersistentEnumeratorBase.RecordBufferHandler<PersistentEnumeratorBase<?>> recordHandler) {
    myExternalKeysNoMapping = false;
    super.setRecordHandler(recordHandler);
  }
@Override
  public void setRecordHandler(@NotNull PersistentEnumeratorBase.RecordBufferHandler<PersistentEnumeratorBase<?>> recordHandler)