On flights to/ from India ALLmeals in economy are either AVML or Western vegetarian as a choice for passengers. This due to enormous amount of passengers requesting special meals. Therefore this choice is not offered. In WBC a special AVML/HINDU meal etc can be selected. In economy its still possible to order different special meals Glutenfree and the likes.
As a passenger i noticed that the service on flights to India is much smoother/faster by offering only vega meals ! enjoy your trip!

If your bookingscode /pnr already has a AVML in the system then this will be same for next flight/same pnr.. But once again on the flight to Inidia there is always enough Asan veg.
I fly frequently to India and never see any issues with that.