Knowledge server space filling up

We implemented HPSM 9.40 on 1/26 and today I got notified by the server team that the Knowledge server is running out of space.  I looked and folder \Program Files\HP\Service Manager 9.40\SearchEngine\tomcat\temp is filling up with tons of temp files that are all  881 kb each.  They all have names similar to "poi-ooxml-2872101701021890898.tmp"

Can I delete these?  Looks like they didn't start getting created until 3/6/16.