What's a Black Hole Kick?

The Milky Way has undergone at least five major mergers in history that we can detect. The merger emits the now famous and distinctive chirp that our gravitational wave detectors can now see. A newly merged black hole could reach escape velocity from a low mass globular cluster, right? If you look at these globular clusters, they don't have central black holes. This may be the reason why they're relatively easy to be ejected.