Unable to get progress logs from a docker container running in detached mode

[nikhilo]

I'm trying to run riot as a Docker container. Since I'm planning to run live replication on a pretty huge DB, I would like to get the logs from riot into a logging solution such as ELK.
When I run the container in foreground with docker run -it, I'm able to see the continuous progress in stdout.
However, when I run the container with docker run -d, I'm unable to get continuous progress in the logs.
I tried using several different parameter combinations,

--progress log
--progress log --info
--log-file /var/log/riot.log
--progress log --info --log-file /var/log/riot.log

No updates show up with I run

docker logs --follow riot
OR
tail -f /var/log/riot.log (in case of --log-file)

Only when I stop the container, the log line shows up,

Scanning/Listening 100% [=============] 18551/18551 (0:01:25 / 0:00:00) 218.2/s

How can I collect the logs from riot docker container and ship them to a logging solution ?