Can't sync my data with Algolia server, using Laravel 5.6

I am developing Intranet system on Laravel 5.6. I have installed Scout and Algolia as described in official documentation. Registered account on Algolia and put both Application ID and Admin API Key to scout.php. Scout engine is set to Algolia. But Algolia does not work. Even Batch Import (php artisan scout:import “App\MyModel”) tells that data is imported, but no changes on server affected. While trying to find the reason I discovered, that Scout is using NullEngine.
What should I do to make him use Algolia Engine?
Thank you.