Handle ECS-compatible deprecation logs emitted by ES 8.0.0+#17728

Merged

ycombinator merged 4 commits intoelastic:masterfrom ycombinator:fb-es-deprecation-800-ecs

Apr 17, 2020

+391-2

Commits on Apr 16, 2020

Commits on Apr 17, 2020

Merge branch 'master' into fb-es-deprecation-800-ecs
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