The node search box is context sensitive, it is generally quite clever at guessing what you’re trying to do. It does, however, revolve around the idea that you know the searched node’s target already. In this case it expects you to have a handle of the player controller:
It may sometimes help to disable the context sensitive search (upper right corner), especially when dealing with some obscure nodes you’re unfamiliar with. There is a lot of nodes in there!
Essentially, it filters by reference, dragging the white execution wire gives you a slew of generic options.