question: public QueryBuilder < C , F > returnTheseAttributes ( CoreTokenField ... returnFields ) { Reject . ifTrue ( returnFields == null || returnFields . length == 0 ) ; Set < String > attributes = new HashSet < String > ( ) ; for ( CoreTokenField field : returnFields ) { attributes . add ( field . toString ( ) ) ; } return setReturnAttributes ( attributes ) ; }
target:  Limit the search to return only the named attributes.