这里做elasticsearch搜索分页的时候

使用$count = $searchModel->count(); 

报出这个错误 [reason] => No search type for [count]

$searchModel = ProductSearch::find()->query([
    "multi_match" => [
        "query" => $keyword,
        "fields" => ["name", "descr"],
    ],
]);
$count = $searchModel->count();

使用$count = $searchModel->all();是可以的

query方法里的count()是这样的

public function count($q = '*', $db = null)
{
    // TODO consider sending to _count api instead of _search for performance
    // only when no facety are registerted.
    // http://www.elastic.co/guide/en/elasticsearch/reference/current/search-count.html
    // http://www.elastic.co/guide/en/elasticsearch/reference/1.x/_search_requests.html

    $options = [];
    $options['search_type'] = 'count';

    return $this->createCommand($db)->search($options)['hits']['total'];
}