* @param sessionId The session ID.
     * @return The number of access results for the session.
     */
    @Override
    public int getCount(final String sessionId) {
        return getCount(builder -> builder.setQuery(QueryBuilders.termQuery(SESSION_ID, sessionId)));
    }

    /**
     * Deletes all access results for a specific session.
     *
     * @param sessionId The session ID.
     */
    @Override

        final Object url = params.get("url");
        if (url == null) {
            return StringUtil.EMPTY_STRINGS;
        }
        final SearchResponse response = client.prepareSearch(index)
                .setQuery(QueryBuilders.termQuery(fessConfig.getIndexFieldUrl(), url))
                .setFetchSource(false)
                .setSize(fessConfig.getPageScoreBoosterMaxFetchSizeAsInteger())
                .execute()

        final String hostname = ComponentUtil.getSystemHelper().getHostname();
        final SearchResponse searchResponse = client.prepareSearch(indexName)
                .setQuery(QueryBuilders.termQuery("hostname", hostname))
                .setSize(searchSize)
                .addSort("timestamp", SortOrder.ASC)
                .execute()
                .actionGet(fessConfig.getIndexSearchTimeout());

            return searchEngineClient.getDocumentList(fessConfig.getIndexDocumentSearchIndex(), searchRequestBuilder -> {
                searchRequestBuilder.setPreference(Constants.SEARCH_PREFERENCE_LOCAL)
                        .setQuery(pair.getValue2())
                        .setSize(keyMatch.getMaxSize());
                return true;
            });
        }
        return Collections.emptyList();
    }

    /**

        setupEpg(_epgMap, et -> ((KeyMatch) et).getMaxSize(), (et, vl) -> ((KeyMatch) et).setMaxSize(DfTypeUtil.toInteger(vl)), "maxSize");
        setupEpg(_epgMap, et -> ((KeyMatch) et).getQuery(), (et, vl) -> ((KeyMatch) et).setQuery(DfTypeUtil.toString(vl)), "query");
        setupEpg(_epgMap, et -> ((KeyMatch) et).getTerm(), (et, vl) -> ((KeyMatch) et).setTerm(DfTypeUtil.toString(vl)), "term");

suggester.switchIndex();                // Switch to new index
suggester.removeDisableIndices();       // Cleanup old indices
```

**Async Operations:**
```java
suggester.suggest()
    .setQuery("search")
    .execute()
    .done(response -> { /* handle success */ })
    .error(throwable -> { /* handle error */ });
```

---

## Important Notes

### Thread Safety

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return searchEngineClient.getDocument(fessConfig.getIndexDocumentUpdateIndex(), builder -> {
            builder.setQuery(QueryBuilders.idsQuery().addIds(id));
            builder.setFetchSource(fields, null);
            return true;
        }).orElse(null);
    }

    /**

        SearchResponse response = getClient().get(c -> c.prepareSearch(index)
                .setScroll(new TimeValue(scrollTimeout))
                .setQuery(QueryBuilders.boolQuery().filter(QueryBuilders.termQuery(SESSION_ID, oldSessionId)))
                .setSize(scrollSize)
                .execute());
        String scrollId = response.getScrollId();
        try {

        try {
            SearchResponse response = client.prepareSearch()
                    .setIndices(actualIndex)
                    .setScroll(settings.getScrollTimeout())
                    .setQuery(QueryBuilders.termQuery(FieldNames.ARRAY_KEY, key))
                    .setSize(DEFAULT_SEARCH_SIZE)
                    .execute()
                    .actionGet(settings.getSearchTimeout());

    private long getNum(final QueryBuilder queryBuilder) {
        final SearchResponse searchResponse = client.prepareSearch()
                .setIndices(getSearchAlias(index))
                .setSize(0)
                .setQuery(queryBuilder)
                .setTrackTotalHits(true)
                .execute()
                .actionGet(suggestSettings.getSearchTimeout());
        return searchResponse.getHits().getTotalHits().value();
    }