How to index .EVTX file stored in a different location on a universal forwarder?

HI All, I would like to index .evtx file stored in a different location in my universal forwarder. E:\Logs\Events\Fixed.Evtx What are the approaches we have, to index these files? I read some documentation but with few concerns, like it should not be written while read by splunk? if so, how can we achieve this? Regards, BK