In a group which is multi national I would not expect any problems. There are bars and areas which cater for Indians, just as those which cater for Japanese and other nationalities and certainly a non-Japanese would rarely go into a bar catering for Japanese, although many times I did when working for a Japanese company. Same probably applies for bars catering for Indians.

I would say definitely come, go with the flow, buy drinks if in a bar where is is 'expected' but be careful watching the bill and enjoy. Don't linger for hours over a drink and share with a friend.