But I'll give it a try.

As I thought, it doesn't work: https://travis-ci.org/yrodiere/hibernate-search/jobs/309039178#L642
Executing the go-offline goal requires a "standard" dependency resolution first, so even if we exclude artifacts from the resolution in 'go-offline', the "standard" resolution will ignore these exclusions and fail when not finding "hibernate-search-engine" for instance.