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                My bad - simply was Visual Studio not referencing the namespace.
You need to include
using EPiServer.Find.Framework.Statistics;
 
    
    
    
Is statistics tracking supported using Unified Search?
I've found that the Track() method is not supported in a statement like this:
SearchClient.Instance.UnifiedSearch(Language.English)
.For(query)
.Track()
.GetResult()
I am referencing the latest Find dlls - 7.0.586.16