Adding Nested fields in Parent Child

Hi, I am trying to figuring out if it is possible to have nested fields (an array) in child. Basically I have a parent and a children that can contain an array of values. And it works fine in ES 5.6 Now when I am migrating it to ES 6.5, it does not work. Any help in this regards will be really appreciated.

Regards,
Akash

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