Jim Ferenczi 0ff6356b7e Revert "Never reduce the same agg twice"
This change reverts 5e4ba4a60ecc1169e86c1dd517ed05a225c5278b
Incremental reduction of aggs should also work with a single aggregation now that InternalTopHits.equals
 is fixed.
2017-02-21 18:48:28 +01:00
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