Dimitris Athanasiou 34f116eae3 Require explicit query in _delete_by_query API (#23632)
As the query of a search request defaults to match_all,
calling _delete_by_query without an explicit query may
result in deleting all data.

In order to protect users against falling into that
pitfall, this commit adds a check to require the explicit
setting of a query.

Closes #23629
2017-03-28 15:44:57 +01:00

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[[breaking_60_java_changes]]
=== Java API changes
==== `setSource` methods require XContentType
Previously the `setSource` methods and other methods that accepted byte/string representations of
an object source did not require the XContentType to be specified. The auto-detection of the content
type is no longer used, so these methods now require the XContentType as an additional argument when
providing the source in bytes or as a string.
=== `DeleteByQueryRequest` requires an explicitly set query
In previous versions of Elasticsearch, delete by query requests without an explicit query
were accepted, match_all was used as the default query and all documents were deleted
as a result. From version 6.0.0, a `DeleteByQueryRequest` requires an explicit query be set.