Geohash aggregation with parent/child documents (grouping by parent id)

Elastic Stack Elasticsearch
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I am looking to do a geohash aggregation on a parent/child relationship. Our data model looks like the following:
A contact can have multiple different types of locations associated with it (parent: contact, child: location). The location documents contain a geo_point data type.

We have started to look at parent/child due to the cost of having to update the parent document anytime any locations change.

We want to be able to the list of geohash grid buckets that contain a count of the number of unique contacts (parent id). Is this possible? We are using ES 6.0.0

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