private function registerWithImporter($emailContactIds, $subscribersFile, $websiteId)
    {
        $subscriberNum = count($emailContactIds);
        if (is_file($this->file->getFilePath($subscribersFile))) {
            if ($subscriberNum > 0) {
                //register in queue with importer
                $check = $this->importerFactory->create()
                    ->registerQueue(
                        \Dotdigitalgroup\Email\Model\Importer::IMPORT_TYPE_SUBSCRIBERS,
                        '',
                        \Dotdigitalgroup\Email\Model\Importer::MODE_BULK,
                        $websiteId,
                        $subscribersFile
                    );
                //mark contacts as imported
                if ($check) {
                    $this->emailContactResource->updateSubscribers($emailContactIds);
                }
            }
        }
    }