code: private String getFieldAccessorName(TypeToken<?> recordType, String fieldName) {
      return String.format("%s$%s", normalizeTypeName(recordType), fieldName);
    }
docs: Generates the name of the class field for storing {@link FieldAccessor} for the given record field.
  @param recordType Type of the record.
  @param fieldName name of the field.
  @return name of the class field.