I didn't even remember there being one on the lens, even after the OP mentioned it.
BTW Warren (or others), the manual for the X-E2 states that when the body is set to IS when "Shooting Only" that the IS will activate when the shutter release is half pressed. Mine doesn't do that. The IS doesn't activate until the shutter is fully released - doesn't do much for stabilizing the image while composing/framing. What's your observations?