Add some types for interpter plugin registration#31600

Merged

stacey-gammon merged 4 commits intoelastic:masterfrom stacey-gammon:2019-02-20-legacy-server-type

Mar 5, 2019

+73-13

Commits on Mar 4, 2019

Commits on Mar 5, 2019

fix build and address code review comments
stacey-gammon
committed