} catch (final IOException e) {
                        throw new IORuntimeException(e);
                    }
                    if (!systemHelper.calibrateCpuLoad(timeout)) {
                        breakCursor = true;
                    }
                }
            });
        };
    }

    /**
     * Get the write call for user info ndjson.

    private static class TestSystemHelper extends SystemHelper {
        long processingTime = 0;
        long currentTime = System.currentTimeMillis();

        @Override
        public boolean calibrateCpuLoad() {
            // Do nothing
            return true;
        }

        @Override
        public long getCurrentTimeAsLong() {
            long time = currentTime;

     */
    public boolean calibrateCpuLoad() {
        return calibrateCpuLoad(0L);
    }

    /**
     * Calibrates the CPU load with a timeout.
     *
     * @param timeoutInMillis The timeout in milliseconds.
     * @return true if the CPU load is within the acceptable range, false otherwise.
     */
    public boolean calibrateCpuLoad(final long timeoutInMillis) {

            reader.addSort(SortBuilders.scoreSort());
            return reader;
        }, docPerReq, () -> {
            systemHelper.calibrateCpuLoad();
            ThreadUtil.sleep(interval);
        }).then(response -> {
            refresh();
            success.accept(true);
        }).error(t -> error.accept(t));
    }

    /**

     */
    protected void process(final FessConfig fessConfig, final ThumbnailQueue entity) {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        systemHelper.calibrateCpuLoad();

        if (logger.isDebugEnabled()) {
            logger.debug("Processing thumbnail: {}", entity);
        }
        final String generatorName = entity.getGenerator();
        try {

        }

        @Override
        public String generateDocId(Map<String, Object> map) {
            return "doc_" + System.currentTimeMillis();
        }

        @Override
        public boolean calibrateCpuLoad() {
            cpuLoadCallCount.incrementAndGet();
            return true;
        }

        @Override
        public void waitForNoWaitingThreads() {
            // Do nothing in test
        }

                    if (interval > 0) {
                        // sleep
                        ThreadUtil.sleep(interval); // 10 sec (default)
                    }

                    systemHelper.calibrateCpuLoad();
                    systemHelper.waitForNoWaitingThreads();

                    intervalControlHelper.delayByRules();

                    if (logger.isDebugEnabled()) {