[6.5] [ML] Fixes missing y-axis description for rare chart. (#24823)#24837

Merged

walterra merged 1 commit intoelastic:6.5from walterra:backport/6.5/pr-24823

Oct 30, 2018

+90-3

Commits on Oct 30, 2018

[ML] Fixes missing y-axis description for rare chart. (elastic#24823 )
walterra
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