Isswp101\Persimmon\QueryBuilder\QueryBuilder::merge PHP Method

    protected function merge(array $query, $mode = 'must')
    {
        if (!array_key_exists('filter', $this->query['body'])) {
            $this->query['body']['filter']['bool'][$mode] = [];
        }
        $this->query['body']['filter']['bool'][$mode][] = $query;
        return $this;
    }