* @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getPagingPageRangeSizeAsInteger();

    /**
     * Get the value for the key 'paging.page.range.fill.limit'. <br>
     * The value is, e.g. true <br>
     * comment: The option 'fillLimit' of page range for paging

        BeanUtil.copyBeanToBean(list, pager, option -> option.include(Constants.PAGER_CONVERSION_RULE));
        pager.setPageNumberList(list.pageRange(op -> {
            op.rangeSize(fessConfig.getPagingPageRangeSizeAsInteger());
        }).createPageNumberList());

        return list;
    }

    /**
     * Updates the pager with aggregation result information.
     *