Hello mate !
I had the same issue, I fixed it by uncommenting the line in one of the file : /usr/share/kibana/plugins/opendistro_security/lib/multitenancy/migrate_tenants.js
Uncomment, remove the //, in front of the line :
import { KibanaMigrator } from ‘…/…/…/…/src/server/saved_objects/migrations’;
Hope it helps.
Thi