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

    /**
     * Get the value for the key 'paging.search.page.size'. <br>
     * The value is, e.g. 10 <br>
     * comment: Default size of search results per page.

            if (StringUtil.isBlank(start)) {
                startPosition = fessConfig.getPagingSearchPageStartAsInteger();
            } else {
                try {
                    startPosition = Integer.parseInt(start);
                } catch (final NumberFormatException e) {
                    startPosition = fessConfig.getPagingSearchPageStartAsInteger();
                }
            }
            return startPosition;

        @Override
        public String getSort() {
            return null;
        }

        @Override
        public int getStartPosition() {
            return fessConfig.getPagingSearchPageStartAsInteger();
        }

        @Override
        public int getPageSize() {
            return pageSize;
        }

        @Override
        public int getOffset() {