code: func newStringTokenStream() *StringTokenStream {
  	ans := &StringTokenStream{TokenStreamImpl: analysis.NewTokenStream()}
  	ans.termAttribute = ans.Attributes().Add("CharTermAttribute").(CharTermAttribute)
  	ans.offsetAttribute = ans.Attributes().Add("OffsetAttribute").(OffsetAttribute)
  	return ans
  }
docs: /*
  Creates a new TokenStream that returns a string as single token.
  
  Warning: Does not initialize the value, you must call setValue() afterwards!
  */