elasticsearch/elasticsearch — pull request #4383 by martijnvg (2013-12-09 12:08:48+00:00)
Title: Adding `force_source` in highlighting to support highlighting in percolator in stored fields.

Added the `force_source` option to highlighting that enforces to use of the _source even if there are stored fields. The percolator uses this option to deal with the fact that the MemoryIndex doesn't support stored fields, this is possible b/c the _source of the document being percolated is always present.