Sorry, the vindicaar is parked outside Azeroth serving as the maternity of lightforged players, and cant be moved because ... reasons.
I think one of the reasons is that the lightforged have their light beam racial, so it must stay focused all the time to charge the beam for all the online lightforged that use that racial.
There you go, a useless reason for Blizzard to forget an overpowered alliance weapon an let it stay in the forgotten depths of wow.