elasticsearch_dsl::search::queries::joining

Struct HasChildQuery

pub struct HasChildQuery { /* private fields */ }

Expand description

Returns parent documents whose joined child documents match a provided query. You can create parent-child relationships between documents in the same index using a join field mapping.

To create has_child query:

Query::has_child("child", Query::term("tag", "elasticsearch"));

https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-has-child-query.html

Implementations§

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impl HasChildQuery

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pub fn ignore_unmapped(self, ignore_unmapped: bool) -> Self

Indicates whether to ignore an unmapped type and not return any documents instead of an error. Defaults to false.

If false, Elasticsearch returns an error if the type is unmapped.

You can use this parameter to query multiple indices that may not contain the type.

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pub fn max_children(self, max_children: u32) -> Self

Maximum number of child documents that match the query allowed for a returned parent document. If the parent document exceeds this limit, it is excluded from the search results.

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pub fn min_children(self, min_children: u32) -> Self

Minimum number of child documents that match the query required to match the query for a returned parent document. If the parent document does not meet this limit, it is excluded from the search results.

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pub fn score_mode(self, score_mode: HasChildScoreMode) -> Self

Indicates how scores for matching child documents affect the root parent document’s relevance score.

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pub fn inner_hits(self, inner_hits: InnerHits) -> Self

The parent-join and nested features allow the return of documents that have matches in a different scope. In the parent/child case, parent documents are returned based on matches in child documents or child documents are returned based on matches in parent documents. In the nested case, documents are returned based on matches in nested inner objects.

In both cases, the actual matches in the different scopes that caused a document to be returned are hidden. In many cases, it’s very useful to know which inner nested objects (in the case of nested) or children/parent documents (in the case of parent/child) caused certain information to be returned. The inner hits feature can be used for this. This feature returns per search hit in the search response additional nested hits that caused a search hit to match in a different scope.

Inner hits can be used by defining an inner_hits definition on a nested, has_child or has_parent query and filter.

https://www.elastic.co/guide/en/elasticsearch/reference/current/inner-hits.html

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pub fn boost<T>(self, boost: T) -> Self
where T: AsPrimitive<f32>,

Floating point number used to decrease or increase the relevance scores of a query. Defaults to 1.0.

You can use the boost parameter to adjust relevance scores for searches containing two or more queries.

Boost values are relative to the default value of 1.0. A boost value between 0 and 1.0 decreases the relevance score. A value greater than 1.0 increases the relevance score.

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pub fn name<S>(self, name: S) -> Self
where S: ToString,

You can use named queries to track which queries matched returned documents. If named queries are used, the response includes a matched_queries property for each hit.

https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-bool-query.html#named-queries