When using defaults show where search match extracts are coming from

The idea is that right now the default is to search in DOCUMENT but the search results show some extracts from xproperties too.

It would be nice to show in the UI from which property the match is found.

For example: search for "first blog post" in a default jetty/hsqldb XE. You'll get the xobject "content" and "title" properties matching but in the display it's impossible to see that the match is coming from these properties.