Cherry-pick of 15643 to 7.x: [metricbeat] add service metricset to reference documentation (#15643)#15703

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fearful-symmetry merged 1 commit intoelastic:7.xfrom fearful-symmetry:backport_15643_7.x

Jan 22, 2020

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Commits on Jan 21, 2020

[metricbeat] add service metricset to reference documentation (elastic#15643 )
fearful-symmetry
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