*
     * @return execution result message, empty if successful or error message if failed
     */
    public String execute() {
        final SearchLogHelper searchLogHelper = ComponentUtil.getSearchLogHelper();

        final StringBuilder resultBuf = new StringBuilder();

        try {
            searchLogHelper.storeSearchLog();
        } catch (final Exception e) {

        if (fessConfig.isSearchLog()) {
            final String userSessionId = userInfoHelper.getUserCode();
            if (userSessionId != null) {
                final SearchLogHelper searchLogHelper = ComponentUtil.getSearchLogHelper();
                final ClickLog clickLog = new ClickLog();
                clickLog.setUrlId((String) doc.get(fessConfig.getIndexFieldId()));
                clickLog.setUrl(url);

            favoriteLogLambda.accept(userInfo, favoriteLog);
            favoriteLogBhv.insert(favoriteLog);
            if (fessConfig.isLoggingSearchUseLogfile()) {
                ComponentUtil.getSearchLogHelper().writeSearchLogEvent(favoriteLog);
            }
            return true;
        }).orElse(false);
    }

    /**
     * Retrieves a list of URLs that are in the user's favorites from the provided URL list.