: "field" : "" // this is the field that I want to learn which document has : it.
How you (can) query for a field value like that is going to depend entirely on the FieldTYpe/Analyzer ... if it's a string field, of uses KeywordTokenizer then q=field:"" should find it -- if you use a more traditional analyzer then it probably didn't produce any terms for hte input "" and from Solr's perspective a document that was indexed using an empty string value is exactly the same as a document that had no value when index. In essenc,e your question is equivilent to asking "How can i search for doc1, but not doc2, evne though i'm using LowerCaseAnalyzer which produces exactly the same indexe terms or both... doc1: Quick Fox doc2: quick fox -Hoss http://www.lucidworks.com/
