* @param cursor Function to process each document in the result set
     * @param userBean Optional user information for permission checking
     * @return Total number of documents processed
     */
    public long scrollSearch(final SearchRequestParams params, final BooleanFunction<Map<String, Object>> cursor,
            final OptionalThing<FessUserBean> userBean) {
        LaRequestUtil.getOptionalRequest().ifPresent(request -> {

        }

        final long startTime = System.currentTimeMillis();

        try {
            final AtomicLong processedCount = new AtomicLong(0);
            final long count = searchEngineClient.scrollSearch(fessConfig.getIndexDocumentSearchIndex(), requestBuilder -> {
                requestBuilder.setQuery(query).setSize(scrollSize);
                return true;
            }, source -> {

        if (numFound > fessConfig.getIndexerMaxResultWindowSizeAsInteger().longValue()) {
            final List<Map<String, Object>> entityList = new ArrayList<>(Long.valueOf(numFound).intValue());
            searchEngineClient.scrollSearch(fessConfig.getIndexDocumentUpdateIndex(), requestBuilder -> {
                requestBuilder.setQuery(queryBuilder).setSize((int) numFound);
                if (fields != null) {