public enum Highlightable {
	NO, // we don't apply or check for anything additional, and at the same time we don't allow highlighting to be called on this field
	ANY, // we make sure that any of the highlighter types can be applied
	PLAIN, // for the Lucene backend - make sure that the field is stored
	UNIFIED, // for the Lucene backend - make sure that the field is stored
	FVH // check that we set the correct term vector value, for the Lucene backend - make sure that field is stored
}