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 " }
} ]
}
}