// alias
        final String aliasConfigDirPath = getResourcePath(indexConfigPath, fessConfig.getFesenType(), "/" + index + "/alias");
        try {
            final File aliasConfigDir = ResourceUtil.getResourceAsFile(aliasConfigDirPath);
            if (aliasConfigDir.isDirectory()) {
                stream(aliasConfigDir.listFiles((dir, name) -> name.endsWith(".json"))).of(stream -> stream.forEach(f -> {