hamd I have no idea why your status went to "not successful", quite frankly your guess is as good as mine.
Like moose said it could be due to your location but I highly doubt it. I seriously doubt it's because some Indian applicants come with fraudulent hours or crash the sim during the interview, or that EK doesn't want to hire too many from a single nationality (India wont be up there for sure)
If anything the big problem with pilots with Indian licenses is the DGCA. The airlines will certify the pilots logbook= that isn't the issue. The headache is the 6 month notice period and the DGCA not bothering about or replying to foreign authorities with verifications etc. Again no idea about your application but Indians do still get interviewed .....