It is actually an outdated-fashioned expression and native speakers of English tend not to utilize it. It is actually used in neither British English nor American English. It is sweet in order to avoid ‘revered’ in salutations. I could not come across some other authoritative advice on Indian English greetings https://dotcom-directory.com/listings13274386/5-simple-statements-about-best-scotch-whisky-in-atlanta-ga-explained