@Override
            public String getQueryFacetFields() {
                return "field1, field2, field3";
            }

            @Override
            public String getQueryFacetFieldsSize() {
                return "10";
            }

            @Override
            public Integer getQueryFacetFieldsSizeAsInteger() {
                return 10;
            }

            @Override

     * The value is, e.g. 100 <br>
     * comment: Size of facet fields.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getQueryFacetFieldsSize();

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