SharePoint 2013 Keyword Query (KQL) Content Class Property Restrictions

Using property restrictions in your KQL queries, you can restrict your search to only pull back certain things like calendar events for instance. This is a very powerful way to limit search results and get exactly what you are looking for.

You can use these in your query like this:
"lunch contentclass:STS_ListItem_Events"
This will return only calendar events with the word "lunch" in them.  Pretty powerful and pretty simple.

Here is a list of available content class items:
Thanks to a post from Marc Schuricht and a post from Jeremy Jameson.

Enjoy!

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