bundle.js & bundle.css are in hashed folders

[EyalSi]

I'm trying to move from choo 6.0.0 to 6.13.0 & bankai 8.1.1 to 9.15.0 (still ;))
Seems like, as opposed to version 8.1.1 where the two files (bundle.js & bundle.css) were created in the root 'dist' folder, they are now created under 'dist/[16 char hex]/bundle.xxx'
Other than keeping old versions, what is the reason for that?
I'm asking as eventually, I need to upload those 2 files along with the assets to Amazon S3, and in order for them to be accessible, I need them in the root folder (otherwise, I will not know their path).

Thanks,
EyalS