*/
    public void updateDocument(final Map<String, Object> doc) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        String language = getSupportedLanguage(DocumentUtil.getValue(doc, fessConfig.getIndexFieldLang(), String.class));
        if (language == null) {
            for (final String f : langFields) {
                if (doc.containsKey(f)) {

                    fessConfig.getIndexFieldClickCount(), //
                    fessConfig.getIndexFieldFavoriteCount(), //
                    fessConfig.getIndexFieldConfigId(), //
                    fessConfig.getIndexFieldLang(), //
                    fessConfig.getIndexFieldHasCache());
        }
        if (scrollResponseFields == null) {
            scrollResponseFields = fessConfig.getQueryAdditionalScrollResponseFields(//

                if (queryBuilder != null) {
                    option.setQuery(queryBuilder);
                }
                return option.setFetchSource(new String[] { fessConfig.getIndexFieldUrl(), fessConfig.getIndexFieldLang() }, null);
            }, (builder, hit) -> {
                try {
                    final Map<String, Object> doc = hit.getSourceAsMap();

        final String indexFieldLastModified = fessConfig.getIndexFieldLastModified();
        final String indexFieldTimestamp = fessConfig.getIndexFieldTimestamp();
        final String indexFieldLang = fessConfig.getIndexFieldLang();
        final List<String> guestRoleList = fessConfig.getSearchGuestRoleList();
        final Date now = systemHelper.getCurrentTime();

                                .getDocumentListByDocIds(clickCountMap.keySet().toArray(new String[clickCountMap.size()]),
                                        new String[] { fessConfig.getIndexFieldDocId(), fessConfig.getIndexFieldLang() },
                                        OptionalThing.of(FessUserBean.empty()), SearchRequestType.ADMIN_SEARCH)
                                .stream()
                                .map(doc -> {

        // TODO date
        // lang
        if (StringUtil.isNotBlank(fessConfig.getCrawlerDocumentFileDefaultLang())) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldLang(), fessConfig.getCrawlerDocumentFileDefaultLang());
        }
        // id
        putResultDataBody(dataMap, fessConfig.getIndexFieldId(), crawlingInfoHelper.generateId(dataMap));
        // parentId

            }

            searchHelper
                    .getDocumentByDocId(docId, new String[] { fessConfig.getIndexFieldUrl(), fessConfig.getIndexFieldLang() },
                            OptionalThing.empty())
                    .ifPresent(doc -> {
                        final String favoriteUrl = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);

                getSingleNodeValue(document, getLangXpath(fessConfig, xpathConfigMap), node -> pruneNode(node, crawlingConfig)));
        if (lang != null) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldLang(), lang);
        }
        // title
        // content
        final String body = getSingleNodeValue(document, getContentXpath(fessConfig, xpathConfigMap),

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

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