public function findOneBy(ClassMetadata $class, $field, $value)
{
$filter = new Term(array($field => $value));
$query = new Query(new Filtered(null, $filter));
$query->setVersion(true);
$query->setSize(1);
$results = $this->search($query, array($class));
if (!$results->count()) {
throw new NoResultException();
}
return $results[0];
}