private final int maxTokenLength;

    public AlphaNumWordFilterFactory(final IndexSettings indexSettings, final Environment environment, final String name,
            final Settings settings) {
        super(indexSettings, name, settings);

        maxTokenLength = settings.getAsInt("max_token_length", AlphaNumWordFilter.DEFAULT_MAX_TOKEN_LENGTH);
    }

    @Override

        },
        "truncate20_filter" : {
          "type" : "truncate",
          "length" : 20
        },
        "alphanum_word_filter" : {
          "type" : "alphanum_word",
          "max_token_length" : 20
        },
        "minhash_filter" : {
          "type" : "minhash",
          "seed" : 1,
          "bit" : 2,
          "size" : 64
        },
        "synonym_filter" : {