[7.x] [Maps] fix term join agg key collision (#63324)#63814

Merged

nreese merged 1 commit intoelastic:7.xfrom nreese:backport/7.x/pr-63324

Apr 17, 2020

+325-33

Commits on Apr 17, 2020

[Maps] fix term join agg key collision (elastic#63324 )

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