A663          ; valid                                  # 5.1  CYRILLIC SMALL LETTER SOFT DE
A664          ; mapped                 ; A665          # 5.1  CYRILLIC CAPITAL LETTER SOFT EL
A665          ; valid                                  # 5.1  CYRILLIC SMALL LETTER SOFT EL
A666          ; mapped                 ; A667          # 5.1  CYRILLIC CAPITAL LETTER SOFT EM

    /**
     * Get the value for the key 'query.additional.sort.fields'. <br>
     * The value is, e.g.  <br>
     * comment: Additional sort fields for queries.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getQueryAdditionalSortFields();

    /**
     * Get the value for the key 'query.additional.sort.fields' as {@link Integer}. <br>