queryRequestBuilder.setQuery(QueryBuilders.matchAllQuery());
            final TermsAggregationBuilder termsBuilder = AggregationBuilders.terms(fessConfig.getIndexFieldSegment())
                    .field(fessConfig.getIndexFieldSegment())
                    .size(maxSessionIdsInList)
                    .order(BucketOrder.key(false));
            queryRequestBuilder.addAggregation(termsBuilder);

                    fessConfig.getIndexFieldFiletype(), //
                    fessConfig.getIndexFieldFilename(), //
                    fessConfig.getIndexFieldLabel(), //
                    fessConfig.getIndexFieldSegment(), //
                    fessConfig.getIndexFieldAnchor(), //
                    fessConfig.getIndexFieldClickCount(), //
                    fessConfig.getIndexFieldFavoriteCount(), //

        //  expires
        if (documentExpires != null) {
            defaultDataMap.put(fessConfig.getIndexFieldExpires(), documentExpires);
        }
        // segment
        defaultDataMap.put(fessConfig.getIndexFieldSegment(), initParamMap.getAsString(Constants.SESSION_ID));
        // created
        defaultDataMap.put(fessConfig.getIndexFieldCreated(), systemHelper.getCurrentTime());
        // boost

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final QueryBuilder queryBuilder = QueryBuilders.termQuery(fessConfig.getIndexFieldSegment(), sessionId);
        return deleteByQueryBuilder(searchEngineClient, index, queryBuilder);
    }

    /**
     * Deletes all documents associated with the specified configuration ID.
     *

        if (documentExpires != null) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldExpires(), documentExpires);
        }
        // segment
        putResultDataBody(dataMap, fessConfig.getIndexFieldSegment(), sessionId);
        // content
        final StringBuilder buf = new StringBuilder(content.length() + 1000);
        if (fessConfig.isCrawlerDocumentFileAppendBodyContent()) {
            buf.append(content);

                    .must(QueryBuilders.termQuery(fessConfig.getIndexFieldConfigId(), dataConfig.getConfigId()))//
                    .mustNot(QueryBuilders.termQuery(fessConfig.getIndexFieldSegment(), sessionId));
            if (!Constants.FALSE.equals(initParamMap.getAsString(KEEP_EXPIRES_DOCS))) {
                final QueryBuilder expiresCheckQuery = QueryBuilders.boolQuery()//

                        new String[] { fessConfig.getIndexFieldId(), fessConfig.getIndexFieldLastModified(),
                                fessConfig.getIndexFieldAnchor(), fessConfig.getIndexFieldSegment(), fessConfig.getIndexFieldExpires(),
                                fessConfig.getIndexFieldClickCount(), fessConfig.getIndexFieldFavoriteCount() });
                if (document == null) {

                    documentHelper.getDigest(responseData, body, dataMap, fessConfig.getCrawlerDocumentHtmlMaxDigestLengthAsInteger()));
        }
        // segment
        putResultDataBody(dataMap, fessConfig.getIndexFieldSegment(), sessionId);
        // host
        putResultDataBody(dataMap, fessConfig.getIndexFieldHost(), getHost(url));
        // site

     * The value is, e.g. segment <br>
     * comment: Field name for segment in the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexFieldSegment();

    /**
     * Get the value for the key 'index.field.role'. <br>
     * The value is, e.g. role <br>
     * comment: Field name for role in the index.