Release aggregations earlier during reduce (#124520) #126541
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Release each hit's aggregations before moving on to the next hit and unlink it from the shard result even earlier. Also, do the aggregation-reduce earlier in the reduce steps to reduce average heap use over time. To that effect, do not do the reduction in the search phase controller. This has the added benefit of removing any need for a fake aggs-reduce-context in scroll.
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Release each hit's aggregations before moving on to the next hit and unlink it from the shard result even earlier. Also, do the aggregation-reduce earlier in the reduce steps to reduce average heap use over time. To that effect, do not do the reduction in the search phase controller. This has the added benefit of removing any need for a fake aggs-reduce-context in scroll.
backport of #124520