Negation inside sameElement operator

[PeterLombaers]

Is your feature request related to a problem? Please describe.
Currently it is not possible to use negations inside the sameElement operator. For example, if we have the query
select * from Schema where persons contains sameElement(first_name contains 'john', !(last_name contains 'doe'))
we get the error
Could not create query from YQL: Child item (-last_name:doe) should be an instance of class com.yahoo.prelude.query.TermItem but is class com.yahoo.prelude.query.NotItem

Describe the solution you'd like
Support for negation inside sameElement.