/** The key of the message: Excluded URLs for Searching */
    public static final String LABELS_EXCLUDED_DOC_URLS = "{labels.excludedDocUrls}";

    /** The key of the message: Hostname */
    public static final String LABELS_HOSTNAME = "{labels.hostname}";

    /** The key of the message: ID */
    public static final String LABELS_ID = "{labels.id}";

    /** The key of the message: Included Paths for Crawling */

     */
    public void usePipeline() {
        usePipeline = true;
    }

    /**
     * Resolves a hostname to an InetAddress.
     *
     * @param host the hostname to resolve
     * @return the resolved InetAddress
     * @throws FessSystemException if hostname resolution fails
     */
    protected InetAddress getInetAddressByName(final String host) {
        try {