*
     * @param node the node to prune
     * @param crawlingConfig the crawling configuration containing pruning rules
     * @return the pruned node
     */
    protected Node pruneNode(final Node node, final CrawlingConfig crawlingConfig) {
        PrunedTag[] prunedTags = null;
        if (crawlingConfig != null) {
            final String configId = crawlingConfig.getConfigId();

        if (configId.length() < 2) {
            throw new FessSystemException("Invalid configId: " + configId);
        }
        final CrawlingConfig config = crawlingConfigHelper.getCrawlingConfig(configId);
        if (config == null) {
            throw new FessSystemException("No crawlingConfig: " + configId);
        }
        final String url = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);