Colin Goodheart-Smithe 87c6e63e73 Adds mutate function to various tests (#25999)
* Adds mutate function to various tests

Relates to #25929

* fix test

* implements mutate function for all single bucket aggs

* review comments

* convert getMutateFunction to mutateIInstance
2017-08-02 11:38:31 +01:00
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