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 sl

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.