public static final String PURGE_SUGGEST_SEARCH_LOG_DAY_PROPERTY = "purge.suggest.searchlog.day";

    public static final String LTR_MODEL_NAME_PROPERTY = "ltr.model.name";

    public static final String LTR_WINDOW_SIZE_PROPERTY = "ltr.window.size";

    public static final String SSO_TYPE_PROPERTY = "sso.type";

    public static final String REQUEST_QUERIES = "fess.Queries";

        setSystemProperty(Constants.LTR_MODEL_NAME_PROPERTY, value);
    }

    default String getLtrModelName() {
        return getSystemProperty(Constants.LTR_MODEL_NAME_PROPERTY, StringUtil.EMPTY);
    }

    default void setLtrWindowSize(final int value) {
        setSystemPropertyAsInt(Constants.LTR_WINDOW_SIZE_PROPERTY, value);
    }

    default int getLtrWindowSize() {