support for ES index with routing

[kakarukeys]

the replication will fail if a routing parameter is enabled on the target ES index
see https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-routing-field.html

Is the support for routing in the roadmap? should I send a pull request?
somewhat related is this pull request: Support parent-child relationship #25
however, routing can be enabled without parent-child.