IDF is very close at the moment. But it can be anyone, ex-soldiers from European countries.
Mercenaries are an integral component of 5th generation warfare along with latest stealth technologies.
India is not very ahead in this game, I grant you, but for not very long. US has strategic interests in Indian territory, Modi has practically sold the country to Trump. The cooperation and engagement is deeper than what many people believe.
India had a NEUTRAL position during UPA government. We used to balance our relations with USA, Russia, China equally. But now under Narendra Modi, we are firmly in USA and Israel camp. Our country really serves their strategic interests. India is no longer having an independent foreign policy, in other words.