Maybe not as lightweight, but GoAccess (https://github.com/allinurl/goaccess) does an awesome job at parsing the logs and displaying statistics, works for nginx and other webservers too
Last time I tried it was a pain to set it up to keep up with log rotations and retain all the records.
For us it was literately an `apt install goaccess`, picked the COMBINED log format and it's been running for over a month in prod without issues (rotating weekly).
You should post the issue on their https://github.com/allinurl/goaccess, they may be able to help you.