protected void updateThumbnailField(final String thumbnailId, final String value) {
        // TODO bulk
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        try {
            ComponentUtil.getIndexingHelper()
                    .updateDocument(ComponentUtil.getSearchEngineClient(), thumbnailId, fessConfig.getIndexFieldThumbnail(), value);
        } catch (final Exception e) {

        if (urlObj == null) {
            throw new DataStoreException("url is null. dataMap=" + dataMap);
        }

        final IndexingHelper indexingHelper = ComponentUtil.getIndexingHelper();
        final CrawlingInfoHelper crawlingInfoHelper = ComponentUtil.getCrawlingInfoHelper();
        dataMap.put(fessConfig.getIndexFieldId(), crawlingInfoHelper.generateId(dataMap));

            final CrawlingInfoHelper crawlingInfoHelper = ComponentUtil.getCrawlingInfoHelper();
            final IndexingHelper indexingHelper = ComponentUtil.getIndexingHelper();
            final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();

            final String url = urlQueue.getUrl();
            ResponseData responseData = null;
            try {

            if (maxAccessCount != 1L) {
                final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();
                final IndexingHelper indexingHelper = ComponentUtil.getIndexingHelper();
                final long count = indexingHelper.deleteDocumentByQuery(searchEngineClient,
                        QueryBuilders.prefixQuery(fessConfig.getIndexFieldUrl(), url));

        return getComponent(KEY_MATCH_HELPER);
    }

    /**
     * Gets the indexing helper component.
     * @return The indexing helper.
     */
    public static IndexingHelper getIndexingHelper() {
        if (indexingHelper == null || HotdeployUtil.isHotdeploy()) {
            indexingHelper = getComponent(INDEXING_HELPER);
        }
        return indexingHelper;
    }

    /**