It depends if the autopilot was engaged or not. If it was then yes the autopilot trims just like the humanpilot does (only better). However if this was during manual flight (such as approach and rollout) I'd wager it was just the pilot trimming the aircraft out using the electric trim switch on the control yoke.
And trimming out a jet is a little different to trimming out a prop. When you trim your 172 you trim to reduce control column force, while leaving the control column displaced. In a large jet you trim so that the control column returns to the neutral position.