Hello guys.
We just switched a customer from Kopano to Grommunio and then realized that the search didn't work very well.
Unfortunately, this didn't help: https://community.grommunio.com/d/1237-grommunio-web-and-outlook-search-unsorted-results-indexing/10
If you narrow down the search period, nothing happens.

You can't manually sort by date either:

Grommunio Version:
rpm -qi gromox | head -n 3
Name : gromox
Version : 2.26.3.a22ec22
Release : lp155.3.2