I remember when Kingfisher was starting up, and luring captains away from other carriers with promises of big pay and big plans. Hmmmm ...
If you're generally treated well, it may be best to stay and work to bring the pay up, as opposed to jumping after a promise. I'm not telling anyone what to do, other than "look before you leap".
As Vinayak implies, I suspect the number seeking to leave Indigo is exaggerated.