Can you tell me which format your are ingesting from these examples. https://learn.microsoft.com/en-us/previous-versions/iis/6.0-sdk/ms525807(v=vs.90) #Software: Internet Information Services 6.0
#Version: 1.0
#Date: 2001-05-02 17:42:15
#Fields: time c-ip cs-method cs-uri-stem sc-status cs-version
17:42:15 172.16.255.255 GET /default.htm 200 HTTP/1.0 OR 192.168.114.201, -, 03/20/01, 7:55:20, W3SVC2, SALES1, 172.21.13.45, 4502, 163, 3223, 200, 0, GET, /DeptLogo.gif, -,
172.16.255.255, anonymous, 03/20/01, 23:58:11, MSFTPSVC, SALES1, 172.16.255.255, 60, 275, 0, 0, 0, PASS, /Intro.htm, -, Once you confirm which format someone should be able to provide a recommended props.conf for the ingested sourcetype. Ofcourse you could opt for the app from Splunk base which looks to be very complete for IIS server logs. https://splunkbase.splunk.com/app/3185
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