code: function _deleteOne(model, _id, hardDelete, Log) {
    let request = { params: { _id: _id } }
    return _deleteOneHandler(model, _id, hardDelete, request, Log)
  }
docs: DeleteOne function exposed as a mongoose wrapper.
  @param model: A mongoose model.
  @param _id: The document id.
  @param hardDelete: Flag used to determine a soft or hard delete.
  @param Log: A logging object.
  @returns {object} A promise returning true if the delete succeeds.
  @private