[7.x] [Maps] Mark instance state as readonly (#60557)#60566

Merged

thomasneirynck merged 1 commit intoelastic:7.xfrom thomasneirynck:backport/7.x/pr-60557

Mar 19, 2020

+9-9

Commits on Mar 18, 2020

[Maps] Mark instance state as readonly (elastic#60557 )
thomasneirynck
committed