final String sessionId = "poll_session4";
        final int numThreads = 5;
        final int itemsPerThread = 10;
        final List<OpenSearchUrlQueue> urlQueueList = new ArrayList<>();

        // Insert items
        for (int i = 1; i <= itemsPerThread * numThreads; i++) {
            final OpenSearchUrlQueue urlQueue = new OpenSearchUrlQueue();

        final int numThreads = 10;
        final ExecutorService executor = Executors.newFixedThreadPool(numThreads);
        final CountDownLatch latch = new CountDownLatch(numThreads);
        final AtomicInteger callbackCount = new AtomicInteger(0);

        // Add listeners concurrently from multiple threads
        for (int i = 0; i < numThreads; i++) {
            executor.submit(() -> {

                int numThreads = ComponentUtil.getFessConfig().getRankFusionThreadsAsInteger();
                if (numThreads <= 0) {
                    numThreads = Runtime.getRuntime().availableProcessors() * 3 / 2 + 1;
                }
                if (logger.isDebugEnabled()) {
                    logger.debug("Initializing executor service with {} threads", numThreads);
                }