protected final Set<String> tagFieldNameSet = new HashSet<>();

    protected final Set<String> roleFieldNameSet = new HashSet<>();

    protected List<String> contentFieldList;

    protected PopularWordHelper popularWordHelper = null;

    protected long searchStoreInterval = 1; // min

    @PostConstruct
    public void init() {
        if (logger.isDebugEnabled()) {

        }
        final String[] fields = request.getParameterValues("field");

        final PopularWordHelper popularWordHelper = ComponentUtil.getPopularWordHelper();

        final StringBuilder buf = new StringBuilder(255);
        try {
            final List<String> popularWordList =
                    popularWordHelper.getWordList(SearchRequestType.JSON, seed, tags, null, fields, StringUtil.EMPTY_STRINGS);