public function addFacetToCollection($config = [])
{
$facetField = $this->getFilterField();
$facetType = BucketInterface::TYPE_TERM;
$facetConfig = ['size' => 0];
$productCollection = $this->getLayer()->getProductCollection();
$productCollection->addFacet($facetField, $facetType, $facetConfig);
return $this;
}