Update: 08/13/2022
The bot visited our site again on 08/04/2022 (crawler site)
Report: Consolidated Pageviews
Report: Web Crawler User Agents
Report: Top Traffic Source
Clearly letting the bot MegaIndex.ru/2.0 index the site does not appear to be generating traffic to the site.
Note: AFAIK yandex.ru is different from Megaindex.ru.
For blocking crawlers there is robots.txt which as noted
https://<Discoruse site>/admin/customize/robots
but not all crawlers will honor robots.txt. 
