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))