Its not that Tapas isn't working, it hasn't met the required parameters. Requirement by Indian Armed forces, was a UAV that could reach altitude of 30,000 feet and fly for 24 hrs. Tapas currently can reach only 28,000 feet and has a flight time of 18 hrs.
Due to this, the project has been taken out of mission mode. They now want to strap on a more powerful engine, but this has to be seen. Current news is that Navy and coastguard might induct it, in limited numbers.
Swift is the scaled down version that was developed, as a Tech demonstrator to validate flying wing configuration. It has been flown and landed successfully, and Ghatak is the full version that is planned. It is supposed to be built in next 2 to 3 years.