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279a18a527
* Add parent-join module This change adds a new module named `parent-join`. The goal of this module is to provide a replacement for the `_parent` field but as a first step this change only moves the `has_child`, `has_parent` queries and the `children` aggregation to this module. These queries and aggregations are no longer in core but they are deployed by default as a module. Relates #20257
36 lines
1.0 KiB
Plaintext
36 lines
1.0 KiB
Plaintext
[[java-aggs-bucket-children]]
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==== Children Aggregation
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Here is how you can use
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{ref}/search-aggregations-bucket-children-aggregation.html[Children Aggregation]
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with Java API.
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===== Prepare aggregation request
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Here is an example on how to create the aggregation request:
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[source,java]
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--------------------------------------------------
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AggregationBuilder aggregation =
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AggregationBuilders
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.children("agg", "reseller"); <1>
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--------------------------------------------------
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1. `"agg"` is the name of the aggregation and `"reseller"` is the child type
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===== Use aggregation response
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Import Aggregation definition classes:
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[source,java]
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--------------------------------------------------
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import org.elasticsearch.join.aggregations.Children;
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--------------------------------------------------
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[source,java]
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--------------------------------------------------
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// sr is here your SearchResponse object
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Children agg = sr.getAggregations().get("agg");
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agg.getDocCount(); // Doc count
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--------------------------------------------------
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