Jim Ferenczi 1b879ea8ac Refactor children aggregator into a generic ParentJoinAggregator (#34845) ... This commit adds a new ParentJoinAggregator that implements a join using global ordinals in a way that can be reused by the `children` and the upcoming `parent` aggregation. This new aggregator is a refactor of the existing ParentToChildrenAggregator with two main changes: * It uses a dense bit array instead of a long array when the aggregation does not have any parent. * It uses a single aggregator per bucket if it is nested under another aggregation. For the latter case we use a `MultiBucketAggregatorWrapper` in the factory in order to ensure that each instance of the aggregator handles a single bucket. This is more inlined with the strategy we use for other aggregations like `terms` aggregation for instance since the number of buckets to handle should be low (thanks to the breadth_first strategy). This change is also required for #34210 which adds the `parent` aggregation in the parent-join module. Relates #34508		2018-10-26 16:26:45 +02:00
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src	Refactor children aggregator into a generic ParentJoinAggregator (#34845)	2018-10-26 16:26:45 +02:00
build.gradle	Add parent-join module (#24638)	2017-05-12 15:58:06 +02:00