[APM] Improve type safety across application boundaries#42252

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sorenlouv wants to merge 13 commits intoelastic:masterfrom

sorenlouv:improve-backend-to-frontend-contract

Commits on Aug 2, 2019

Replace mutations with ternaries
sorenlouv
committed

Commits on Aug 6, 2019

Merge branch 'master' of github.com:elastic/kibana into improve-backend-to-frontend-contract
sorenlouv
committed