* The value is, e.g. label <br>
     * comment: Fields for facet queries.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getQueryFacetFields();

    /**
     * Get the value for the key 'query.facet.fields.size'. <br>
     * The value is, e.g. 100 <br>
     * comment: Size of facet fields.