New answers tagged crawled-property
If you create a new managed property you must run a full crawl before it becomes available. You don't necessarily need search to do a traditional full crawl of all content though - you can force it to just do a full on your intended site. In the settings for the library where the look up column exists, under advanced settings there is button to Re-Index ...
Try use the Search Query Tool (https://sp2013searchtool.codeplex.com/) - open advanced mode on the left side and click the checkbox. Then do a search for your item. Then in primary results click on "view all properties" and verify that your property is in the collection and what value it contains.
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