public function bulkWrite(array $operations, array $options = [])
    {
        if ( ! isset($options['writeConcern'])) {
            $options['writeConcern'] = $this->writeConcern;
        }

        $operation = new BulkWrite($this->databaseName, $this->collectionName, $operations, $options);
        $server = $this->manager->selectServer(new ReadPreference(ReadPreference::RP_PRIMARY));

        return $operation->execute($server);
    }