I'm in the need to write a Lucene query string (I cannot use ES DSL unfortunately) to match all documents where a given field is missing: e.g. something like _missing_:mydoc.field. I tried the _exists_ special field, but the query _exists_:mydoc.field matches documents where mydoc.field is assigned an empty array. I need only those where the mydoc.field is not set at all.
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