Elastic 6.3: Is there any way where I can define use same routing as parent?

Elastic Stack Elasticsearch
1

I am using Elastic6.3 version.
Since parent and child must use same routing (in order to present in same shard)
Is there any setting/parameter where while indexing child document mention that use routing same as parent instead of passing routing attribute?

Thanks.

2

No. You must pass the routing key which should be the parent id by default.