Nik Everett 89c0e1f566
Fix composite agg sort bug (backport of #53296) (#53337)
When an composite aggregation is run against an index with a sort that
*starts* with the "source" fields from the composite but has additional
fields it'd blow up in while trying to decide if it could use the sort.
This changes it to decide that it *can* use the sort.

Closes #52480
2020-03-10 11:32:46 -04:00
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