Kibana multi-tenancy limitations

Hi,

According to the documentation, for every new tenant, an underlying .kibana_* index is created. That is, if my application creates 10,000 users we will end up creating at least 10,000 indices on elasticsearch just for kibana which would overload the cluster. Am i right? What are the limitations of the Kibana multi-tenancy? Can i use Document level security with the .kibana index?

Thanks!
Regards,
Mahmoud