/**
  * {@inheritdoc}
  */
 public function getQueryTypesForFacet(FacetInterface $facet)
 {
     // Get our Facets Field Identifier, which is equal to the Search API Field
     // identifier.
     $field_id = $facet->getFieldIdentifier();
     // Get the Search API Server.
     $server = $this->index->getServerInstance();
     // Get the Search API Backend.
     $backend = $server->getBackend();
     $fields = $this->index->getFields();
     foreach ($fields as $field) {
         if ($field->getFieldIdentifier() == $field_id) {
             return $this->getQueryTypesForDataType($backend, $field->getType());
         }
     }
     throw new InvalidQueryTypeException($this->t("No available query types were found for facet @facet", ['@facet' => $facet->getName()]));
 }