*
     * @param keyObj the crawler object to track (UrlQueue, StatsKeyObject, String, or Number)
     */
    public void begin(final Object keyObj) {
        getCacheKey(keyObj).ifPresent(key -> {
            try {
                statsCache.get(key);
            } catch (final Exception e) {
                final StringBuilder buf = createStringBuffer(keyObj, getCurrentTimeMillis());

        final String[] baseExcludes = excludes != null ? excludes : fessConfig.getSuggestPopularWordExcludesAsArray();
        try {
            return cache.get(getCacheKey(baseSeed, baseTags, baseRoles, baseFields, baseExcludes), () -> {
                final List<String> wordList = new ArrayList<>();
                final SuggestHelper suggestHelper = ComponentUtil.getSuggestHelper();