In many disputed successions for hereditary local office Aurangzeb chose candidates who had converted to Islam over the rivals. Pragana headmen and qanungos or recordkeepers were targeted especially for pressure to convert.
Regarding Hindus serving for Mughal emperors especially Aurangzeb.
These were alliances of convenience (in fact Indians should take note what happens when they fight amongst themselves). Aurangzeb had made the titles hereditary and the Hindu Zamindars wanted to legitimise their rule. Tactically this was a smart move by Aurangzeb to get the Hindus rulers into his orbit by getting them onside and then sorting them out one by one, divide and rule. Jaswant Singh is a case in point, just after he died all temples in his kingdom were destroyed. Earlier the mansabdari system too was created to incorporate these "civilized" and settled centres of society, by Akbar, it was based on sem-meritocracy to enable non-muslims to rise to a position of some power. Aurangzeb simply used it as a divide and rule instrument.
