[1.x] Expand definitions of source and destination field sets (#967)#973

Merged

ebeahan merged 1 commit intoelastic:1.xfrom ebeahan:backport/1.x/pr-967

Sep 23, 2020

+70-22

Commits on Sep 23, 2020

Expand definitions of source and destination field sets (elastic#967 )
ebeahan
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