* The value is, e.g. count.desc <br>
     * comment: Sort order for facet fields.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getQueryFacetFieldsSort();

    /**
     * Get the value for the key 'query.facet.fields.missing'. <br>
     * The value is, e.g.  <br>
     * comment: Value for missing facet fields.