I\'m currently incapable of deserialize an avro PRIMITIVE key in a KSTREAM APP
the key in encoded with an avro schema ( registered in the schema registr
Update
it's now working : https://stackoverflow.com/a/51957801/6227500
Original answer
The feature is not available currently in the schema registry project.
But by implementing a custom SERDE you can manage the case ,
Thiyaga Rajan proposed a working implementation
Serde class for AVRO primitive type