private function createModels($rows)
    {
        $models = [];
        if ($this->asArray) {
            if ($this->indexBy === null) {
                return $rows;
            }
            foreach ($rows as $row) {
                if (is_string($this->indexBy)) {
                    $key = isset($row['fields'][$this->indexBy]) ? reset($row['fields'][$this->indexBy]) : $row['_source'][$this->indexBy];
                } else {
                    $key = call_user_func($this->indexBy, $row);
                }
                $models[$key] = $row;
            }
        } else {
            /* @var $class ActiveRecord */
            $class = $this->modelClass;
            if ($this->indexBy === null) {
                foreach ($rows as $row) {
                    $model = $class::instantiate($row);
                    $modelClass = get_class($model);
                    $modelClass::populateRecord($model, $row);
                    $models[] = $model;
                }
            } else {
                foreach ($rows as $row) {
                    $model = $class::instantiate($row);
                    $modelClass = get_class($model);
                    $modelClass::populateRecord($model, $row);
                    if (is_string($this->indexBy)) {
                        $key = $model->{$this->indexBy};
                    } else {
                        $key = call_user_func($this->indexBy, $model);
                    }
                    $models[$key] = $model;
                }
            }
        }

        return $models;
    }