final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String thumbnailId = DocumentUtil.getValue(docMap, fessConfig.getIndexFieldId(), String.class);
        final Tuple3<String, String, String> task = new Tuple3<>(getName(), thumbnailId, path);
        if (logger.isDebugEnabled()) {
            logger.debug("Create thumbnail task: {}", task);

        SearchResponse response = client.prepareSearch(index)
                .setScroll(scrollForDelete)
                .setSize(sizeForDelete)
                .setFetchSource(new String[] { fessConfig.getIndexFieldId() }, null)
                .setQuery(queryBuilder)
                .setPreference(Constants.SEARCH_PREFERENCE_LOCAL)
                .execute()
                .actionGet(fessConfig.getIndexScrollSearchTimeout());

                                .stream()
                                .map(doc -> {
                                    final String id = DocumentUtil.getValue(doc, fessConfig.getIndexFieldId(), String.class);
                                    final String docId = DocumentUtil.getValue(doc, fessConfig.getIndexFieldDocId(), String.class);

                        }

                        final String id = DocumentUtil.getValue(doc, fessConfig.getIndexFieldId(), String.class);
                        searchHelper.update(id, builder -> {
                            final Script script = ComponentUtil.getLanguageHelper()

        final String scoreField = fessConfig.getRankFusionScoreField();
        final Map<String, Map<String, Object>> documentsByIdMap = new HashMap<>();
        final String idField = fessConfig.getIndexFieldId();
        final Set<Object> mainSearcherIdSet = new HashSet<>();
        for (int searcherIndex = 0; searcherIndex < results.length; searcherIndex++) {

                        if (Float.isFinite(score)) {
                            docMap.put(Constants.SCORE, score);
                        }
                    }

                    docMap.put(fessConfig.getIndexFieldId(), hit.getId());
                    docMap.put(fessConfig.getIndexFieldVersion(), hit.getVersion());
                    docMap.put(fessConfig.getIndexFieldSeqNo(), hit.getSeqNo());

            putResultDataBody(dataMap, fessConfig.getIndexFieldLang(), fessConfig.getCrawlerDocumentFileDefaultLang());
        }
        // id
        putResultDataBody(dataMap, fessConfig.getIndexFieldId(), crawlingInfoHelper.generateId(dataMap));
        // parentId
        String parentUrl = responseData.getParentUrl();
        if (StringUtil.isNotBlank(parentUrl)) {

                stream(crawlingConfig.getVirtualHosts()).get(stream -> stream.filter(StringUtil::isNotBlank).collect(Collectors.toList())));
        // id
        putResultDataBody(dataMap, fessConfig.getIndexFieldId(), crawlingInfoHelper.generateId(dataMap));
        // parentId
        String parentUrl = responseData.getParentUrl();
        if (StringUtil.isNotBlank(parentUrl)) {

        final String configId = DocumentUtil.getValue(doc, fessConfig.getIndexFieldConfigId(), String.class);
        if (configId == null) {
            final String docId = DocumentUtil.getValue(doc, fessConfig.getIndexFieldId(), String.class);
            throw new FessSystemException("configId is null in document. docId: " + docId);
        }
        if (configId.length() < 2) {

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

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