Can we set the index upload interval

Hi. I noticed that when using Loki with two instances, boltdb shipper and azure storage that the index files are uploaded each 15m.

This means that it takes 15 minutes before all data can be found using Grafana. Before that it depends on which of the instances is contacted. Can we infleunce this 15m?

I use OpenShift with statefull set.

Kind regards,