Due to AWS migration I have to migrate from ElasticSearch to OpenSearch. The OpenSearch will be provisioned by AWS OpenSearch Service.
The existing documents in ES index has parent/child relationship created using join field type. I don't see such mapping type in the OpenSearch documentation.
Question: How can I define parent/child relationship in OpenSearch?
UPDATED:
The currently used ES version is 6.8. As for migration, the preference is to use the latest OpenSearch version.