Symfony 4 Match Against sort by relevanece - symfony

Question

I want to sort by revelance that mean if i have in db:
FooBa
FooBar
FooB
Foo
and i want to type foo it will be sorted:
Foo
FooB
FooBa
FooBar
public function findBySearchQueryPagin2(string $rawQuery, int $limit = 999, string $sort = "DESC", string $sortBy = "relevance", int $page = 1): pagerfanta
{
$query = $this->sanitizeSearchQuery($rawQuery);
$sort = $this->sanitizeSearchQuery($sort);
$sortBy = $this->sanitizeSearchQuery($sortBy);
$limit = $this->sanitizeSearchQuery($limit);
$page = $this->sanitizeSearchQuery($page);
if(($sort != 'ASC')&&($sort != 'DESC')) $sort = 'DESC';
if(($sortBy != 'date')&&($sortBy != 'name')&&($sortBy != 'relevance')){
$sortBy = null;
} else {
if($sortBy=="name") $sortBy = "primarytitle";
if($sortBy=="date") $sortBy = "startyear";
if($sortBy=="relevance") $sortBy = "relevance";
}
$queryBuilder = $this->createQueryBuilder('p')
->andWhere("MATCH_AGAINST (p.primarytitle, :searchTerms) > 1")
->setParameter('searchTerms', $query)
->setMaxResults($limit);
var_dump($query);
if($sortBy !== "relevance"){
$queryBuilder
->orderBy('p.' . $sortBy, $sort);
}
return $this->createPaginator($queryBuilder->getQuery(), $page);
}