84 lines
2.3 KiB
Plaintext
84 lines
2.3 KiB
Plaintext
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[[query-dsl-has-parent-query]]
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=== Has Parent Query
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The `has_parent` query works the same as the
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<<query-dsl-has-parent-filter,has_parent>>
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filter, by automatically wrapping the filter with a constant_score (when
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using the default score type). It has the same syntax as the
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<<query-dsl-has-parent-filter,has_parent>>
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filter. This query is experimental and is available from version
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`0.19.10`.
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[source,js]
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--------------------------------------------------
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{
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"has_parent" : {
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"parent_type" : "blog",
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"query" : {
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"term" : {
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"tag" : "something"
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}
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}
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}
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}
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--------------------------------------------------
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[float]
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==== Scoring capabilities
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The `has_parent` also has scoring support from version `0.20.2`. The
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supported score types are `score` or `none`. The default is `none` and
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this ignores the score from the parent document. The score is in this
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case equal to the boost on the `has_parent` query (Defaults to 1). If
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the score type is set to `score`, then the score of the matching parent
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document is aggregated into the child documents belonging to the
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matching parent document. The score type can be specified with the
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`score_type` field inside the `has_parent` query:
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[source,js]
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--------------------------------------------------
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{
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"has_parent" : {
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"parent_type" : "blog",
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"score_type" : "score",
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"query" : {
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"term" : {
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"tag" : "something"
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}
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}
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}
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}
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--------------------------------------------------
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[float]
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==== Scope
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The `_scope` support has been removed from version `0.90.beta1`. See:
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https://github.com/elasticsearch/elasticsearch/issues/2606
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A `_scope` can be defined on the filter allowing to run facets on the
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same scope name that will work against the parent documents. For
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example:
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[source,js]
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--------------------------------------------------
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{
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"has_parent" : {
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"_scope" : "my_scope",
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"parent_type" : "blog",
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"query" : {
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"term" : {
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"tag" : "something"
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}
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}
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}
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}
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--------------------------------------------------
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[float]
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==== Memory Considerations
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With the current implementation, all `_id` values are loaded to memory
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(heap) in order to support fast lookups, so make sure there is enough
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memory for it.
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