public static final String JCIFS_PREFIX = "jcifs.";
            public static final String HTML_CANONICAL_XPATH = "html.canonical.xpath";
            public static final String HTML_PRUNED_TAGS = "html.pruned.tags";
            public static final String PIPELINE = "pipeline";
            public static final String IGNORE_ROBOTS_TAGS = "ignore.robots.tags";
            public static final String SCRIPT_TYPE = "script.type";

                if (matcher.group(4) != null) {
                    tag.setId(matcher.group(4).substring(1));
                }
                return tag;
            }
            throw new FessSystemException("Invalid pruned tag: " + v);
        }).toArray(n -> new PrunedTag[n]));
    }

    /** The key of the configuration. e.g. noscript,script,style,header,footer,aside,nav,a[rel=nofollow] */
    String CRAWLER_DOCUMENT_HTML_PRUNED_TAGS = "crawler.document.html.pruned.tags";

    /** The key of the configuration. e.g. 120 */
    String CRAWLER_DOCUMENT_HTML_MAX_DIGEST_LENGTH = "crawler.document.html.max.digest.length";

    /** The key of the configuration. e.g.  */

crawler.document.html.lang.xpath=//HTML/@lang
crawler.document.html.digest.xpath=//META[@name='description']/@content
crawler.document.html.canonical.xpath=//LINK[@rel='canonical'][1]/@href
crawler.document.html.pruned.tags=noscript,script,style,header,footer,aside,nav,a[rel=nofollow]
crawler.document.html.max.digest.length=120
crawler.document.html.default.lang=
crawler.document.html.default.include.index.patterns=

            if (prunedTags == null) {
                final Map<String, String> configMap = crawlingConfig.getConfigParameterMap(ConfigName.CONFIG);
                final String value = configMap.get(CrawlingConfig.Param.Config.HTML_PRUNED_TAGS);
                if (StringUtil.isNotBlank(value)) {
                    prunedTags = PrunedTag.parse(value);
                }
                if (prunedTags == null) {