reader = new StringReader(sb.toString());
        } else if (settings.get("synonyms_path") != null) {
            if (settings.getAsBoolean("dynamic_reload", false)) {
                final String filePath = settings.get("synonyms_path", null);

                if (filePath == null) {
                    throw new IllegalArgumentException("synonyms_path is not found.");
                }

            if (settings.getAsList("synonyms", null) != null) {
                logger.warn("synonyms values are empty.");
            } else if (settings.get("synonyms_path") != null) {
                logger.warn("synonyms_path[{}] is empty.", settings.get("synonyms_path"));
            } else {
                logger.debug("No synonym data.");
            }
        }
    }

    @Override
    public Tokenizer create() {

          "type" : "minhash",
          "seed" : 1,
          "bit" : 2,
          "size" : 64
        },
        "synonym_filter" : {
          "type" : "synonym_graph",
          "synonyms_path": "${fess.dictionary.path}synonym.txt"
        }
      },
      "tokenizer": {
        "japanese_tokenizer": {
          "type": "fess_japanese_tokenizer",
          "mode": "normal",