class Elasticsearch::DSL::Search::Queries::Exists
Returns documents that have at least one non-null value in the field.
@example Find documents with non-empty “name” property
search do query do exists do field 'name' end end end
@note The “Exists” query can be used as a “Missing” query in a “Bool” query “Must Not” context.
@example Find documents with an empty “name” property
search do query do bool do must_not do exists do field 'name' end end end end end
@see www.elastic.co/guide/en/elasticsearch/reference/5.1/query-dsl-exists-query.html