As the days wear on, the issue of any debris drift does indeed become more and more of a factor. No one knows where the plane is, so I'm just putting this out there as a go-to reference in case something eventually turns up:
Real-time Navy model website for sea-surface temperature and currents:
HYCOM 1/12 degree page
The Indonesian Flowthrough and Indian Ocean are the most relevant sectors. As a point of reference, 100 cm/s is equal to 1.9 knots, and 1.9 knots is 46 nm/day (EDIT: typo on 1.9, fixed, sorry). Most values are well below this.
Chart for the point roughly halfway between the crash and now, as a general reference since there is little day to day change: