Not sure if you're just looking to tick a box, in which case you could probably get by with a travel insurance policy, or if you actually want a proper policy that covers you in Indonesia for accident and illness. You may wish to check out the following company,
http://www.globality-health.com/downloads/Produktbroschueren_YouGenio_world/Globality_YouGenioWorld_PB_EN.pdf which has reasonably priced plans with premiums based on the costs of treatment in the country of residence, i.e., for you, Indonesia.