[[children-agg]] === Children Aggregation
Parent-child supports a
http://bit.ly/1xtpjaz[`children` aggregation] as ((("aggregations", "children aggregation")))((("children aggregation")))((("parent-child relationship", "children aggregation")))a direct analog to the nested aggregation discussed in
<>. A parent aggregation (the equivalent of
reverse_nested) is not supported.
This example demonstrates how we could determine the favorite hobbies of our employees by country:
GET /company/branch/_search?search_type=count { "aggs": { "country": { "terms": { <1> "field": "country" }, "aggs": { "employees": { "children": { <2> "type": "employee" }, "aggs": { "hobby": { "terms": { <3> "field": "employee.hobby" } } } } } } } }
<1> The country field in the branch documents.
<2> The children aggregation joins the parent documents with
their associated children of type employee.
<3> The hobby field from the employee child documents.