Modelling data with Joins in Elasticsearch

I indent to transfer data from a RDBMS source to elasticsearch and perform various aggregation queries on it. For this purpose, I need to perform some joins on the data. I was looking into parent-child relationships.
I need suggestions on how to model and index the data to perform aggregation queries

It is always better to do joins at index time instead of using parent child IMO.

May share some typical data you have?

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