On version 4.3.4, I copied the file from the "search" app and added this to the equivalent spot. (I've removed the angle brackets to ensure it appears.)
param name="default" index=myindex /param
I ran "splunk btool fix-dangling" as I use pooled search heads. I had to log out and back in to see the change. ("index=myindex" appears automatically in the search box.) All seems to be working well in the short time it's been modified.
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