}

    default String getCsvFileEncoding() {
        return getSystemProperty(Constants.CSV_FILE_ENCODING_PROPERTY, Constants.UTF_8);
    }

    default void setPurgeSearchLogDay(final int value) {
        setSystemPropertyAsInt(Constants.PURGE_SEARCH_LOG_DAY_PROPERTY, value);
    }

    default int getPurgeSearchLogDay() {

        fessConfig.setWebApiPopularWord(isCheckboxEnabled(form.popularWord));
        fessConfig.setCsvFileEncoding(form.csvFileEncoding);
        fessConfig.setPurgeSearchLogDay(form.purgeSearchLogDay);
        fessConfig.setPurgeJobLogDay(form.purgeJobLogDay);
        fessConfig.setPurgeUserInfoDay(form.purgeUserInfoDay);