Jim Ferenczi fa8e76abb1
Improve reduction of terms aggregations (#61779) (#62028)
Today, the terms aggregation reduces multiple aggregations at once using a map
to group same buckets together. This operation can be costly since it requires
to lookup every bucket in a global map with no particular order.
This commit changes how term buckets are sorted by shards and partial reduces in
order to be able to reduce results using a merge-sort strategy.
For bwc, results are merged with the legacy code if any of the aggregations use
a different sort (if it was returned by a node in prior versions).

Relates #51857
2020-09-07 13:13:20 +02:00
..

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