Thanks!
I updated to 2.0.6 and now my firewall logs are being assigned the sourcetype of "pfsense:filterlog". So that's an improvement.
However, it seems the fields within the logs still aren't being parsed. For example, my latest log line looks like:
Feb 14 08:19:21 filterlog: 5,16777216,,1000000103,bge1,match,block,in,4,0xc0,,46,12426,0,none,1,icmp,1.1.1.1,2.2.2.2,unreachport,1.1.1.1,UDP,5384
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