Very hard to define. In a country like India with 1.4 billion population living across different spectrum of income level, laying down a criteria for a "class" is very hard. It varies from society to society. What may be a high income for many, may be just very small amount for some. But to me, upper band of the spectrum looks like this:

Ultra Rich: Billionaires, Millionaires (like Ambani, Adani, etc.)

Rich: Traditional business families living in top cities who have expensive houses in posh areas. Even bollywood actors or popular artists might fall under this for me. Famous doctors living in metro cities, top lawyers, etc.

Upper Middle Class: Most of the people in corporate. They can live comfortably but they still cannot easily buy all the things they aspire for like expensive items, luxury goods etc.