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51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
[[java-aggs-bucket-reverse-nested]]
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==== Reverse Nested Aggregation
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Here is how you can use
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{ref}/search-aggregations-bucket-reverse-nested-aggregation.html[Reverse Nested 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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.nested("agg").path("resellers")
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.subAggregation(
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AggregationBuilders
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.terms("name").field("resellers.name")
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.subAggregation(
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AggregationBuilders
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.reverseNested("reseller_to_product")
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)
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);
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--------------------------------------------------
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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.search.aggregations.bucket.nested.Nested;
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import org.elasticsearch.search.aggregations.bucket.nested.ReverseNested;
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import org.elasticsearch.search.aggregations.bucket.terms.Terms;
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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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Nested agg = sr.getAggregations().get("agg");
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Terms name = agg.getAggregations().get("name");
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for (Terms.Bucket bucket : name.getBuckets()) {
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ReverseNested resellerToProduct = bucket.getAggregations().get("reseller_to_product");
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resellerToProduct.getDocCount(); // Doc count
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}
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--------------------------------------------------
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