@Inject
 public JiebaTokenFilterFactory(
     IndexSettings indexSettings, @Assisted String name, @Assisted Settings settings) {
   super(indexSettings, name, settings);
   type = settings.get("seg_mode", "index");
   Environment env = new Environment(indexSettings.getSettings());
   WordDictionary.getInstance().init(env.pluginsFile().resolve("jieba/dic"));
 }