Finding documents with empty string as value · Issue #7515 · elastic/ elasticsearch · GitHub
API token is empty
ElasticSearch Create, Query, Delete Index - Java Example - Analytics Yogi
c# - NEST Elastic search empty values in Documents result - Stack Overflow
Boolean field accepts an empty string, does not index as `null` · Issue #61038 · elastic/elasticsearch · GitHub
Filter document with not null value in Kibana Discover. Should I use "exist", but it still return me docs with empty field - Kibana - Discuss the Elastic Stack