private Set<LdapUserDto> getFilteredLdapUsers(String baseDn, Filter... filters) {
    AndFilter andFilter = new AndFilter();
    for (Filter filter : filters) {
      andFilter.and(filter);
    }
    return getFilteredLdapUsers(baseDn, andFilter);
  }
Retrieves users from external LDAP server.

@return set of info about LDAP users
ambari-server/src/main/java/org/apache/ambari/server/security/ldap/AmbariLdapDataPopulator.java