Search for nested field in json

I have an index which has documents in this form of nested json. I want to search for values of the field LeftText in the mentioned link using a bool must match. How do I write the query? (ES 5.6)

This link should help you write the query.

I tried using this but was unable to form the query. Can you write a query to search for keys of LeftText in the above json link?

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