N1ql How to use a GSI when doing a join

SQL++
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Hello Couchbase Experts.

I have created a GSI Index but I have no idea how to write a query where I can specify how to use this newly created index in a join using the keyword “USE INDEX [index_name] [index_type]”

http://developer.couchbase.com/documentation/server/current/n1ql/n1ql-language-reference/hints.html

The documentation only tells me how to use the "USE INDEX’ key word in a simple select statement. I’d like to know if this can be done using a JOIN NEXT CONTAINS etc…

Also if you could give me some example on how to do this.

Thanks in advance.