I never saw Ellington, but I'm told by a friend who has seen him that the song was a staple in Duke's live set for quite a few years. That probably accounts for why the song is so strongly associated with Duke, even though it was written by Earle Hagan. AFAIK, Duke never recorded it.
Marty
BTW, If you'd like to hear a mind bending rendition of the song, try Danny Gatton's transcription for electric guitar. That might be my single favorite cover song ever.