fa8e76abb1
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 |
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