[5.5] Backport. ensure we are working with data-series (#13266)#13275

Merged

thomasneirynck merged 1 commit intoelastic:5.5from thomasneirynck:5.5_fix/label

Aug 1, 2017

+10-3

Commits on Aug 1, 2017

ensure we are working with data-series (elastic#13266 )
thomasneirynck
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