Google Force Enables Bot-Traffic Exclusion in Google Analytics App + Web Propertieshttps://support.google.com
Google has started automatically excluding bot traffic from App + Web properties in Google Analytics. Bot traffic is identified using a combination of Google research and the International Spiders and Bots List, maintained by the Interactive Advertising Bureau (IAB). You cannot disable bot traffic exclusion or see how much bot traffic was excluded.
In Universal Analytics, users had to enable bot exclusion per property.
You can find more information in this Help Center article.