REST changes | Elasticsearch Reference [master]

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REST changesedit

Unquoted JSONedit

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 Smileedit

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.

Analyze API changesedit

The deprecated request parameters and plain text in request body has been removed. Define parameters in request body.

Indices exists APIedit

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.