if (path != null) {
            keywordPath = environment.configDir().resolve(path);
        } else {
            keywordPath = null;
        }

        reloadInterval = settings.getAsTime("reload_interval", TimeValue.timeValueMinutes(1)).getMillis();
    }

    @Override
    public TokenStream create(final TokenStream tokenStream) {
        if (keywordPath == null) {
            return tokenStream;

        } else {
            stopwordPath = null;
        }

        ignoreCase = settings.getAsBoolean("ignore_case", false);
        reloadInterval = settings.getAsTime("reload_interval", TimeValue.timeValueMinutes(1)).getMillis();
    }

    @Override
    public TokenStream create(final TokenStream tokenStream) {
        if (stopwordPath == null) {
            return tokenStream;

                } catch (final Exception e) {
                    throw new IllegalArgumentException("Failed to read " + filePath, e);
                }

                reloadInterval = settings.getAsTime("reload_interval", TimeValue.timeValueMinutes(1)).getMillis();

            } else {
                reader = Analysis.getReaderFromFile(env, settings, "synonyms_path");
            }
        } else {