}

    /**
     * Updates a document with language information.
     *
     * @param doc The document to update.
     */
    public void updateDocument(final Map<String, Object> doc) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        String language = getSupportedLanguage(DocumentUtil.getValue(doc, fessConfig.getIndexFieldLang(), String.class));

                if (langList.contains("auto")) {
                    newDoc.remove(indexFieldLang);
                }
                languageHelper.updateDocument(newDoc);
            }
            return newDoc;
        }).toList();
        if (fessConfig.isThumbnailCrawlerEnabled()) {
            final ThumbnailManager thumbnailManager = ComponentUtil.getThumbnailManager();