Aggregations - Structuring aggregations
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2023-12-01
Structuring aggregations
结构化聚合
如 Aggregations guide 中所述,可以在聚合中定义子聚合。
聚合可能是 Metrics
聚合(一个跟踪和计算指标的聚合)或者 Bucket
聚合 (构建桶聚合)
例如,这里是一个3级聚合组成的聚合:
- Terms aggregation (bucket)
- Date Histogram aggregation (bucket)
- Average aggregation (metric)
SearchResponse sr = node.client().prepareSearch()
.addAggregation(
AggregationBuilders.terms("by_country").field("country")
.subAggregation(AggregationBuilders.dateHistogram("by_year")
.field("dateOfBirth")
.dateHistogramInterval(DateHistogramInterval.YEAR)
.subAggregation(AggregationBuilders.avg("avg_children").field("children"))
)
)
.execute().actionGet();