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[8.0] Revert 74559 (Avoid global ordinals in composite) (#78846) (#80498) #80502

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Nov 8, 2021

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@ywelsch ywelsch commented Nov 8, 2021

Backports the following commits to 8.0:

…astic#80498)

This reverts the change to use segment ordinals in composite terms aggregations due to a performance degradation when the field is high cardinality.

Co-authored-by: Mark Tozzi <[email protected]>
@ywelsch ywelsch added auto-merge-without-approval Automatically merge pull request when CI checks pass (NB doesn't wait for reviews!) backport labels Nov 8, 2021
@elasticsearchmachine elasticsearchmachine merged commit ac67e47 into elastic:8.0 Nov 8, 2021
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