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Structuring aggregationsedit
As explained in the Aggregations guide, you can define sub aggregations inside an aggregation.
An aggregation could be a metrics aggregation or a bucket aggregation.
For example, here is a 3 levels aggregation composed of:
- 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();