protected void createAlias(final String index, final String createdIndexName) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        // alias
        final String aliasConfigDirPath = getResourcePath(indexConfigPath, fessConfig.getFesenType(), "/" + index + "/alias");
        try {
            final File aliasConfigDir = ResourceUtil.getResourceAsFile(aliasConfigDirPath);
            if (aliasConfigDir.isDirectory()) {