}

    /**
     * Gets the name of the filter index for the crawler.
     *
     * @return the filter index name
     */
    @Override
    public String getFilterIndex() {
        return ComponentUtil.getFessConfig().getIndexDocumentCrawlerIndex() + ".filter";
    }

    /**
     * Gets the number of shards for the queue index.
     *
     * @return the number of queue shards