How to change ElasticSearch response to Nested Values

Hi there, I am using ES as the backend data warehouse for my web app. I want to have a dropdown list that updated based on what is previously selected like this : http://benalexkeen.com/auto-updating-dropdown-fields-in-javascript/. The problem I have is how to pass ES response into nested values like in the link. I am using Python Django with elasticsearch_dsl.

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