Elastica\Query::addSort PHP Méthode

    public function addSort($sort)
    {
        return $this->addParam('sort', $sort);
    }

 public function findByUserAndTags(User $user, $tags = null)
 {
     $filterQuery = new Query\Filtered();
     $searchFilter = new Filter\Bool();
     $searchFilter->addMust(new Filter\Term(array('user' => $user->getId())));
     if (!empty($tags)) {
         $tagFilter = new Filter\Terms('tags', explode('+', $tags));
         $tagFilter->setExecution('and');
         $searchFilter->addMust($tagFilter);
     }
     $filterQuery->setFilter($searchFilter);
     $searchQuery = new Query($filterQuery);
     $searchQuery->addSort(array('createdAt' => 'desc'));
     $agg = new Aggregation\Terms('tags');
     $agg->setField('tags')->setOrder('_count', 'desc')->setSize(100);
     $searchQuery->addAggregation($agg);
     return $searchQuery;
 }