Cherry-pick #16858 to 7.x: [libbeat] Document / clean up parts of the publisher queue interface#16897

Merged

faec merged 1 commit intoelastic:7.xfrom faec:backport_16858_7.x

Mar 9, 2020

+41-40

Commits on Mar 9, 2020

[libbeat] Document / clean up parts of the publisher queue interface (elastic#16858 )
faec
committed