Still not possible in 7.2.4 without searching the audit index or building your own searches.
In Alerts for Splunk Admins or github link I have queries like "SearchHeadLevel - Search Queries summary exact match", where I attempt to determine what was queried per-index, you could do a similar search per sourcetype but it might get tricky...
Also you would never get it exactly right for wildcards, I built "SearchHeadLevel - Search Queries summary non-exact match" for that but it is complicated and slow!
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