EventLog Analyzer folder growing very fast

We had 33 hosts, mostly Windows, and EvLa folder was at a steady size (keeping half a year history). We have added a few more Windows hosts and a few linux (which are still not sending anything) and a few days ago i have noticed that EvLa's folder started to grow hugely, 15 GB in a few days and not stopping. Soon it will consume all the space given to it. What can be the cause and what should i do? Haven't tried restarting it, will do shortly. Not sure it will help.

A lot of space are taking these folders:
F:\ManageEngine\EventLog\server\default\indexes\univindexes\warm
F:\ManageEngine\EventLog\server\default\indexes\univindexes\cold
F:\ManageEngine\EventLog\server\default\indexes\univindexes\hot