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Parent Id Query

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Parent Id Query

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Added in 5.0.0.

The parent_id query can be used to find child documents which belong to a particular parent. Given the following mapping definition:

PUT /my_index
{
    "mappings": {
        "blog_post": {
            "properties": {
                "name": {
                    "type": "keyword"
                }
            }
        },
        "blog_tag": {
            "_parent": {
                "type": "blog_post"
            },
            "_routing": {
                "required": true
            }
        }
    }
}

GET /my_index/_search
{
    "query": {
        "parent_id" : {
            "type" : "blog_tag",
            "id" : "1"
        }
    }
}

The above is functionally equivalent to using the following has_parent query, but performs better as it does not need to do a join:

GET /my_index/_search
{
  "query": {
    "has_parent": {
      "parent_type": "blog_post",
        "query": {
          "term": {
            "_id": "1"
        }
      }
    }
  }
}

Parameters

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This query has two required parameters:

`type`	The child type. This must be a type with `_parent` field.
`id`	The required parent id select documents must referrer to.
`ignore_unmapped`	When set to `true` this will ignore an unmapped `type` and will not match any documents for this query. This can be useful when querying multiple indexes which might have different mappings. When set to `false` (the default value) the query will throw an exception if the `type` is not mapped.

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