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Implement top_metrics agg (#51155)

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The `top_metrics` agg is kind of like `top_hits` but it only works on
doc values so it *should* be faster.

At this point it is fairly limited in that it only supports a single,
numeric sort and a single, numeric metric. And it only fetches the "very
topest" document worth of metric. We plan to support returning a
configurable number of top metrics, requesting more than one metric and
more than one sort. And, eventually, non-numeric sorts and metrics. The
trick is doing those things fairly efficiently.

Co-Authored by: Zachary Tong <zach@elastic.co>
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Nik Everett 2020-02-14 07:13:52 -05:00 • committed by GitHub
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docs/java-rest/high-level/aggs-builders.asciidoc
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@ -25,6 +25,7 @@ This page lists all the available aggregations with their corresponding `Aggrega
| {ref}/search-aggregations-metrics-stats-aggregation.html[Stats] | {agg-ref}/metrics/stats/StatsAggregationBuilder.html[StatsAggregationBuilder] | {agg-ref}/AggregationBuilders.html#stats-java.lang.String-[AggregationBuilders.stats()]
| {ref}/search-aggregations-metrics-sum-aggregation.html[Sum] | {agg-ref}/metrics/sum/SumAggregationBuilder.html[SumAggregationBuilder] | {agg-ref}/AggregationBuilders.html#sum-java.lang.String-[AggregationBuilders.sum()]
| {ref}/search-aggregations-metrics-top-hits-aggregation.html[Top hits] | {agg-ref}/metrics/tophits/TopHitsAggregationBuilder.html[TopHitsAggregationBuilder] | {agg-ref}/AggregationBuilders.html#topHits-java.lang.String-[AggregationBuilders.topHits()]
| {ref}/search-aggregations-metrics-top-metrics.html[Top Metrics] | {javadoc-client}/analytics/TopMetricsAggregationBuilder.html[TopMetricsAggregationBuilder] | None
| {ref}/search-aggregations-metrics-valuecount-aggregation.html[Value Count] | {agg-ref}/metrics/valuecount/ValueCountAggregationBuilder.html[ValueCountAggregationBuilder] | {agg-ref}/AggregationBuilders.html#count-java.lang.String-[AggregationBuilders.count()]
| {ref}/search-aggregations-metrics-string-stats-aggregation.html[String Stats] | {javadoc-client}/analytics/StringStatsAggregationBuilder.html[StringStatsAggregationBuilder] | None
|======