Should hysterectomy be done without any indication of cancer but just to get rid of heavy menstruation. ?

Yes: Hysterectomy is done not for just cancer only, but has other indications , like heavy bleeding when medical treatment fails , benign symptomatic fibroids etc , although done less often than few decades ago.

Sometimes: A hysterectomy can be an appropriate treatment for someone with heavy periods that does not respond to other medical treatments.