Elasticsearch index engines (technical preview) | Elastic App Search Documentation [8.2]

IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Elasticsearch index engines (technical preview)edit

Elasticsearch index engines is a technical preview feature. Technical preview features are subject to change and are not covered by the support SLA of general release (GA) features. Elastic plans to promote this feature to GA in a future release.

Since 8.2.0, Elastic Enterprise Search allows you to generate Engines based on existing Elasticsearch indices. With these engines you can use Enterprise Search features on data that has already been ingested into Elasticsearch.

Elasticsearch index engines featuresedit

The following table compares Enterprise Search managed engines with Elasticsearch index engines:

Feature	Engine	Elasticsearch Index Engine
Documents API	Get, List, Create, Update, Delete	Get, List
Schema API	List, Update	List
Search API precision (beta), Precision tuning (beta)	Supported	Unsupported
Usable as a source engine in meta engines	Supported	Unsupported
Synonyms	Supported	Supported
Curations	Supported	Supported
API logs	Supported	Supported
Analytics	Supported	Supported
Adaptive relevance	Supported	Supported

Elasticsearch index engines supported field typesedit

Not all Elasticsearch field types are available in App Search engines. Unsupported field types will be ignored by Enterprise Search, and cannot be used in Enterprise Search features.

Enterprise Search will not modify your data and index mappings.

Unsupported field types will not be removed or altered and remain available for Elasticsearch features and APIs.

The following Elasticsearch field types are supported:

Elasticsearch field type	Corresponding Enterprise Search field type
keyword	text
constant_keyword	text
wildcard	text
text	text
geo_point	geolocation
date	date
date_nanos	date
integer	number
long	number
short	number
byte	number
double	number
float	number
half_float	number
scaled_float	number
unsigned_long	number

See Supported Features, By Field Type for a full App Search field types reference.

Unlike the text field type in Enterprise Search, not all Elasticsearch text fields above have the same features as Enterprise Search text fields: keyword, constant_keyword, wildcard can be filtered, sorted, grouped and faceted. text fields cannot. Having a subfield for text fields will provide those capabilities to the field.

This feature does not support the following Elasticsearch field types: nested field type, object field type.

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