[[breaking-changes-2.2]]
== Breaking changes in 2.2

This section discusses the changes that you need to be aware of when migrating
your application to Elasticsearch 2.2.

* <<breaking_22_index_apis>>

[[breaking_22_index_apis]]
=== Index APIs

==== Field stats API

The field stats' response format has been changed for number based and date fields. The `min_value` and
`max_value` elements now return values as number and the new `min_value_as_string` and `max_value_as_string`
return the values as string.