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What version of CMS are you on?
Is your site definition all still set up correctly. It should get this based on the primary domain on your default site. I'd check that.
Unless you've setup any search conventions it should come through, I've checked and SearchHitUrl exists on our project (CMS 12.17.1)
We have upgraded to CMS 12.18.
Site definition is correct, has been confirmed in another post some days ago : D
We have some customization regarding search conventions but it does not apply to SearchHitUrl and it works on our old version but missing on the migrated one.
Running indexing does not generate errors either.
Any insight how this is controlled? After running indexing job we see that SearchHitUrl is missing though it was present previously.
Before upgrade
After upgrade
And trying to open any of the search results directs to an undefined page.