src/Controller/AdminControllerTrait.php
protected function autocompleteAction()
    {
        $results = $this->get('easyadmin.autocomplete')->find(
            $this->request->query->get('entity'),
            $this->request->query->get('query'),
            $this->request->query->get('page', 1)
        );

        return new JsonResponse($results);
    }
protected function autocompleteAction()
    {
        $results = $this->get('easyadmin.autocomplete')->find(
            $this->request->query->get('entity'),
            $this->request->query->get('query'),
            $this->request->query->get('page', 1)
        );

        return new JsonResponse($results);
    }
The method that returns the values displayed by an autocomplete field
based on the user's input.

@return JsonResponse