How to query lucene for empty fields?

Question

I want in 2nd part of my query to have a list of result for while data not null. I find how do it in solr but not in lucene. Anyone have a idea Thanks

String :

Answer 1

-_exists_:field_one works for me in ElasticSearch 6.0

reference: https://www.elastic.co/guide/en/elasticsearch/reference/6.0/query-dsl-query-string-query.html#_field_names