When my angel goes in front of you, and brings you to the Amorites, the Hittites, the Perizzites, the Canaanites, the Hivites, and the Jebusites, and I blot them out, you shall not bow down to their gods, or worship them, or follow their practices, but you shall utterly demolish them and break their pillars in pieces (Exodus 23.23-24).
From this passage it seems to me that 'ethnic cleansing' can apply to biblical events.