[7.x] remove use of experimental fs.promises api (#53346)#53796

Merged

spalger merged 1 commit intoelastic:7.xfrom spalger:backport/7.x/pr-53346

Dec 26, 2019

+33-20

Commits on Dec 25, 2019

remove use of experimental fs.promises api (elastic#53346 )

Spencer
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elasticmachine
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