I've got a custom search results page and I could do queries with refiners like


to refine the results even more. How would I do this then if I'm interested in items where the Title has no value (e.g. is 'blank')

I've tried


and that doesn't work.


You cannot query on blank or null values. What you need to do is set the value of the target field to a value that indicates it is uninitialized or was previously blank and search for that value.

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