throw new SuggestIndexException(deleteResponse.getErrors().get(0));
        }

        final List<SuggestItem> updateItems = new ArrayList<>();
        SearchResponse response = client.prepareSearch(index).setSize(500).setScroll(settings.getScrollTimeout())
                .setQuery(QueryBuilders.rangeQuery(FieldNames.DOC_FREQ).gte(1)).execute().actionGet(settings.getSearchTimeout());

        final String actualIndex = index + "." + type.toLowerCase(Locale.ENGLISH);
        try {
            SearchResponse response = client.prepareSearch().setIndices(actualIndex).setScroll(settings.getScrollTimeout())
                    .setQuery(QueryBuilders.termQuery(FieldNames.ARRAY_KEY, key)).setSize(500).execute()
                    .actionGet(settings.getSearchTimeout());

        return null;
    }

    @Override
    protected void processRequest(final Client client, final Deferred<SuggestResponse> deferred) {
        final SearchRequestBuilder builder = client.prepareSearch(index);

        if (skipDuplicateWords) {
            builder.setSize(size * 2);
        } else {
            builder.setSize(size);
        }

        // set query.

        client.search(request, listener);
    }

    @Override
    public SearchRequestBuilder prepareSearch(final String... indices) {
        return client.prepareSearch(indices);
    }

    @Override
    public ActionFuture<SearchResponse> searchScroll(final SearchScrollRequest request) {
        return client.searchScroll(request);
    }

    public static boolean deleteByQuery(final Client client, final SuggestSettings settings, final String index,
            final QueryBuilder queryBuilder) {
        try {
            SearchResponse response = client.prepareSearch(index).setQuery(queryBuilder).setSize(500).setScroll(settings.getScrollTimeout())
                    .execute().actionGet(settings.getSearchTimeout());
            String scrollId = response.getScrollId();
            try {

        return getNum(QueryBuilders.rangeQuery(FieldNames.QUERY_FREQ).gte(1));
    }

    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;

        sessionCache.clear();
    }

    @Override
    public void updateSessionId(final String oldSessionId, final String newSessionId) {
        SearchResponse response = getClient().get(c -> c.prepareSearch(index).setScroll(new TimeValue(scrollTimeout))
                .setQuery(QueryBuilders.boolQuery().filter(QueryBuilders.termQuery(SESSION_ID, oldSessionId))).setSize(scrollSize)
                .execute());

    protected long getDocumentSizeByQuery(final SearchEngineClient searchEngineClient, final QueryBuilder queryBuilder,
            final FessConfig fessConfig) {
        final SearchResponse countResponse = searchEngineClient.prepareSearch(fessConfig.getIndexDocumentUpdateIndex())
                .setQuery(queryBuilder).setSize(0).setTrackTotalHits(true).execute().actionGet(fessConfig.getIndexSearchTimeout());

    }

    protected Map<String, FieldAnalyzerMapping> getFieldAnalyzerMapping() {
        final Map<String, FieldAnalyzerMapping> mappingMap = new HashMap<>();
        SearchResponse response = client.prepareSearch(analyzerSettingsIndexName)
                .setQuery(QueryBuilders.termQuery(FieldNames.ANALYZER_SETTINGS_TYPE, FIELD_ANALYZER_MAPPING))