There is no such thing as an indoor bonsai, there are plans that are not hardy and need protection and will survive in the indoor environment. In fact there is no such thing as a houseplant, merely plants that will survive in that environment., and usually not hardy enough to be left out to get frosted.
The only tree I take inside is my Bouganvillea, only because I do not have a greenhouse or frost free environment.
That does not make it an indoor bonsai.