public HighlightOptions addField(String fieldname) {
		Assert.hasText(fieldname, "Fieldname must not be null nor empty!");
		return addField(new SimpleField(fieldname));
	}
public HighlightOptions addField ( String fieldname ) { Assert . hasText ( fieldname , "Fieldname must not be null nor empty!" ) ; return addField ( new SimpleField ( fieldname ) ) ; }
Add name of field to highlight on

@param fieldname
@return