Filter on aggregation over nested docs

Suppose my data consists of businesses and users, who review the businesses
and stay in a particular state. Using the nested structure lets suppose we
store businesses with users as nested docs:
{
"name": "ABC"
"users": [
{"name": "Jack",
"state": "CA"
},
{
"name": "Jill",
"state": "NY"
}
]
}

I want to do a filter of the following nature:

List all businesses which have atleast 4 users from state: CA, which have
reviewed the business.

Ideally this is about putting a facet on top of nested docs and then using
this as a filter. How will that be done using current functionality of
ElasticSearch ?

Thanks in advance !

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