final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final long updateInterval = fessConfig.getIndexerWebfsUpdateIntervalAsInteger().longValue();
        final int maxEmptyListCount = fessConfig.getIndexerWebfsMaxEmptyListCountAsInteger();
        final IntervalControlHelper intervalControlHelper = ComponentUtil.getIntervalControlHelper();
        try {
            final Consumer<SearchRequestBuilder> cb = builder -> {

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getIndexerWebfsMaxEmptyListCountAsInteger();

    /**
     * Get the value for the key 'indexer.webfs.update.interval'. <br>
     * The value is, e.g. 10000 <br>