*/
    String getCrawlerDocumentUnknownHostname();

    /**
     * Get the value for the key 'crawler.document.use.site.encoding.on.english'. <br>
     * The value is, e.g. false <br>
     * comment: Whether to use site encoding for English documents.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */

     * @return The parsed date, or null if parsing fails
     */
    protected Date parseLastModifiedDate(final String value) {
        final SimpleDateFormat sdf = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z", Locale.ENGLISH);
        try {
            return sdf.parse(value);
        } catch (final ParseException e) {
            return null;
        }
    }

    /**

          "type": "pattern_replace",
          "pattern":"(.*)",
          "replacement":""
        }
      },
      "filter": {
        "stemmer_en_filter": {
          "type": "stemmer",
          "name": "english"
        },
        "english_override": {
          "type":       "stemmer_override",
          "rules": []
        },
        "possessive_stemmer_en_filter": {
          "type": "stemmer",

          "type": "pattern_replace",
          "pattern":"(.*)",
          "replacement":""
        }
      },
      "filter": {
        "stemmer_en_filter": {
          "type": "stemmer",
          "name": "english"
        },
        "english_override": {
          "type":       "stemmer_override",
          "rules": []
        },
        "possessive_stemmer_en_filter": {
          "type": "stemmer",

          "名詞-非自立-助動詞語幹",
          "名詞-非自立-副詞可能",
          "名詞-副詞可能",
          "連体詞"
        ]
      },
      "stopword_en_filter": {
        "type": "stop",
        "stopwords": "_english_"
      },
      "content_length_filter": {
        "type": "length",
        "max": 30
      },
      "limit_token_count_filter": {
        "type": "limit",
        "max_token_count": 10000