That's the small sound my 2017 Leaf has started to make as I accelerate from a stop, or apply the brakes. It's as if there's some component of the suspension that's slightly loose, and shifts back and forth as the stresses go between positive and negative acceleration. It started out very quiet, and is ever so slowly getting louder. My judgment on this has been confirmed by one other person who isn't normally attuned to mechanical sounds.
The sound itself I isn't an issue, but I know full well that loose attachment points can wear inordinately quickly, so if something is coming lose, I want it fixed.
Has anyone else ever experienced this?