I don't think << category:* >> does what you think it does.
category:[* TO *] will find all docs that have any indexed tokens in the
category field, so combining that as a prohibited clause with a
mandatory MatchAllDocsQuery will give you all docs that don't have
anything indexed in the category field....
*:* -category:[* TO *]
(although i can't remember if *:* is a Solr extension of part of hte core
QueryParser)
-Hoss
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