Kautilya's Arthashastra 2.32.8

2.32.8

vyālaikakriyāpathaḥ śaṅkito 'varuddho viṣamaḥ prabhinnaḥ prabhinnaviniścayo madahetuviniścayaś ca //

Rogue elephants can be trained only in one way. The only means to keep them under control is punishment. It has a suspicious aversion to work, is obstinate, of perverse nature, unsteady, willful, or of infatuated temper under the influence of rut.