What am I missing? It seems like there has got to be a tool that will allow someone to search for this field. I can search for anything else I have tried via differnet configurations, but Users just seems to be lost.
I don’t know the answer to this. This is a question for Relevanssi support. Also, I’m not sure that it will work because the user field only stores the user ID in the database, so Relevanssi will need to have something that will let you map ID’s to Name. I did find this when I did a search that appears to answer this question https://wordpress.org/support/topic/using-relevanssi-with-advanced-custom-fields