code: func (lft *FieldTranslator) Close() error {
  	errs := make(errorList, 0)
  	err := lft.idMap.Close()
  	if err != nil {
  		errs = append(errs, errors.Wrap(err, "closing idMap"))
  	}
  	err = lft.valMap.Close()
  	if err != nil {
  		errs = append(errs, errors.Wrap(err, "closing valMap"))
  	}
  	if len(errs) > 0 {
  		return errs
  	}
  	return nil
  }
docs: // Close closes the two leveldbs used by the FieldTranslator.