6.6
This section discusses the changes that you need to be aware of when migrating your application to Elasticsearch 6.6.
See also [release-highlights] and [es-release-notes].
Using automatically expanded fields for the "all fields" mode ("default_field": "*")
for the query_string, multi_match and simple_query_string now raises a warning and
a deprecation notice to be logged for queries beyond 1024 fields. This limit will be
enforced with a hard error starting in 7.0.