code: public StructuredQueryDefinition valueConstraint(String constraintName, double weight, String... values) {
      return new ValueConstraintQuery(constraintName, weight, values);
    }
docs: Matches the container specified by the constraint when it
  has a value with the same string value as at least one
  of the criteria values.
  @param constraintName    the constraint definition
  @param weight    the multiplier for the match in the document ranking
  @param values    the possible values to match
  @return    the StructuredQueryDefinition for the value constraint query