protected String updateLuceneMatchVersion(String content, String newLuceneMatchVersion) {
    return content.replaceAll("<luceneMatchVersion>.*</luceneMatchVersion>",
            "<luceneMatchVersion>" + newLuceneMatchVersion + "</luceneMatchVersion>");
  }
@return a map describing the new LDAP configuration key to the old ambari.properties property name
ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog270.java