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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-compatibility layer was added via the
system property `elasticsearch.json.allow_unquoted_field_names`. This backwards-compatibility layer
has been removed in Elasticsearch 6.0.0.
==== Duplicate Keys in JSON, CBOR, Yaml and Smile
In previous versions of Elasticsearch, documents were allowed to contain duplicate keys. Elasticsearch 6.0.0
enforces that all keys are unique. This applies to all content types: JSON, CBOR, Yaml and Smile.
==== Content-Type Auto-detection
In previous versions of Elasticsearch, having a proper Content-Type for the data in a request was not enforced.
Elasticsearch 6.0.0 enforces that all requests with a body must have a supported Content-Type and this type will
be used when parsing the data.
==== Boolean API parameters
All REST APIs parameters (both request parameters and JSON body) support providing boolean "false" as the
value `false` and boolean "true" as the value `true`. All other values will raise an error.
==== Analyze API changes
The deprecated request parameters and plain text in request body has been removed. Define parameters in request body.
==== Indices exists API
The `ignore_unavailable` and `allow_no_indices` options are no longer accepted
as they could cause undesired results when their values differed from their
defaults.
=== `timestamp` and `ttl` in index requests
`timestamp` and `ttl` are not accepted anymore as parameters of index/update
requests.
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