Filtering questions with more than four answers

Next, let's see how we can filter questions that have at least four answers. For this, there is a provision to filter parent documents based on the number of children they have. We can use the min_children attribute to implement this limit:

curl -XPOST 'localhost:9200/posts/post/_search' -d '{
  "query": {
    "has_child": {
      "type": "rating",
      "min_children": 4,
      "query": {
        "match_all": {}
      }
    }
  }
}'

Here, we are telling Elasticsearch to give all parent documents at least four children.

With this, we get the following result:

{
  "took" : 3,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "posts",
      "_type" : "post",
      "_id" : "1",
      "_score" : 1.0,
      "_source":{ "question": " elasticsearch query to return all records " }
    } ]
  }
}

In the result, we can observe...