Kautilya's Arthashastra 2.32.16

2.32.16

cikitsakānīkasthārohakādhoraṇahastipakaupacārikavidhāpācaka.yāvasikapādapāśikakuṭīrrakṣakaupaśayaikādir aupasthāyikavargaḥ //

Elephant doctors, trainers, expert riders, as well as those who groom them, those who prepare their food, those who procure grass for them, those who tether them to posts, those who sweep elephant stables, and those who keep watch in the stables at night, are some of the persons that have to attend to the needs of elephants.