Jason Tedor 27ff4f327c Remove allow unquoted JSON
Previous versions of Elasticsearch permitted unquoted JSON field names even though this is against the JSON spec. This leniency was disabled by default in the 5.x series of Elasticsearch but a backwards compatibility layer was added via a system property with the intention of removing this layer in 6.0.0. This commit removes this backwards compatibility layer.

Relates #20388
2016-09-08 13:36:31 -04:00

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[[breaking_60_rest_changes]]
=== REST changes
==== Unquoted JSON
In previous versions of Elasticsearch, JSON documents were allowed to contain unquoted field names.
This feature was removed in the 5.x series, but a backwards-compability layer was added via the
system property `elasticsearch.json.allow_unquoted_field_names`. This backwards-compability layer
has been removed in Elasticsearch 6.0.0.