backend/models/Search.php

<?php
    
    namespace backend\models;
    
    use artbox\core\admin\models\Search as CoreSearch;
    
    class Search extends CoreSearch
    {
        public function attributeLabels()
        {
            $model = \Yii::createObject($this->model);
            
            return call_user_func(
                [
                    $model,
                    'attributeLabels',
                ]
            );
        }
    }