Ah, but if I don't go through the pain now, I will get to learn an entirely new definition of pain and suffering later on when I (hopefully) have a huge ES search index in production.
You can basically use a 5.x in the same way as 6 (one "type" per index, only one parent-child relation). If you're not doing it that way now - you can start slowly while you're on 5.x and slowly migrate your methodology to the 6.x way (if it's even so different..) Then you can move to 6 more with little change, if you even need to upgrade to 6.
