code: public void activateWord2VecModelRules(File indexDir) throws IOException {
      Word2VecModel word2vecModel = language.getWord2VecModel(indexDir);
      if (word2vecModel != null) {
        ResourceBundle messages = getMessageBundle(language);
        List<Rule> rules = language.getRelevantWord2VecModelRules(messages, word2vecModel);
        userRules.addAll(rules);
      }
    }
docs: Activate rules that depend on a word2vec language model.
  @param indexDir directory with a subdirectories like 'en', each containing dictionary.txt and final_embeddings.txt
  @since 4.0