[6.x] [uiSettings] upgrade old config on read (#24108)#24343

Merged

spalger merged 1 commit intoelastic:6.xfrom spalger:backport/6.x/pr-24108

Oct 23, 2018

+353-25

Commits on Oct 22, 2018

[uiSettings] upgrade old config on read (elastic#24108 )
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committed