public function createLuceneQuery($query = '')
  {

    // remove multiple whitespaces and trim !

    // $andQuery = // implode ( " AND ", explode( " ", trim( preg_replace('/\s+/', ' ',$query)) ));
    $andQuery = aZendSearch::luceneCombineAnd( $query );


    $hits = self::getLuceneIndex()->find($andQuery); // $query
   
    $pks = array();
    foreach ($hits as $hit)
    {
      $pks[] = $hit->pk;
    }
   
    if (empty($pks))
    {
      $pks[] = null;
      // return array();
    }
    
    $q = $this->createQuery('a')
          ->andWhereIn('a.id', $pks);
    // $q = $this->addActiveJobsQuery($q);

    return $q;
  }