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Search Changes

Removal of types

The /{index}/{type}/_search, /{index}/{type}/_msearch, /{index}/{type}/_search/template and /{index}/{type}/_msearch/template REST endpoints have been removed in favour of /{index}/_search, /{index}/_msearch, /{index}/_search/template and /{index}/_msearch/template; since indexes no longer contain types, these typed endpoints are obsolete..

The /{index}/{type}/_termvectors, /{index}/{type}/{id}/_termvectors and /{index}/{type}/_mtermvectors REST endpoints have been removed in favour of /{index}/_termvectors, /{index}/{id}/_termvectors and /{index}/_mtermvectors; since indexes no longer contain types, these typed endpoints are obsolete..

The /{index}/{type}/{doc} and /{index}/{type}/_mget REST endpoints have been removed in favour of /{index}/_doc/{doc} and /{index}/_mget; since indexes no longer contain types, these typed endpoints are obsolete.

Removal of queries

The common query, deprecated in 7.x, has been removed in 8.0. The same functionality can be achieved by the match query if the total number of hits is not tracked.

Removal of query parameters

The cutoff_frequency parameter, deprecated in 7.x, has been removed in 8.0 from match and multi_match queries. The same functionality can be achieved without any configuration provided that the total number of hits is not tracked.

Removal of sort parameters

The nested_filter and nested_path options, deprecated in 6.x, have been removed in favor of the nested context.

Shard allocation awareness in Search and Get requests

{es} will no longer prefer using shards in the same location (with the same awareness attribute values) to process _search and _get requests. Adaptive replica selection (activated by default in this version) will route requests more efficiently using the service time of prior inter-node communications.

Removal of sparse vector fields

The sparse_vector field type was deprecated in 7.6 and is now removed in 8.0. We have not seen much interest in this experimental field type, and don’t see a clear use case as it’s currently designed. If you have feedback or suggestions around sparse vector functionality, please let us know through GitHub or the 'discuss' forums.

Update to vector function signatures

The vector functions of the form function(query, doc['field']) were deprecated in 7.6, and are now removed in 8.x. The form function(query, 'field') should be used instead. For example, cosineSimilarity(query, doc['field']) is replaced by cosineSimilarity(query, 'field').

Object format for indices_boost

The indices_boost option in the search request used to accept the boosts both as an object and as an array. The object format has been deprecated since 5.2 and is now removed in 8.0.

Removal of use_field_mapping for docvalues fields

In 7.0, we began formatting docvalue_fields by default using each field’s mapping definition. To ease the transition from 6.x, we added the format option use_field_mapping. This parameter was deprecated in 7.0, and is now removed in 8.0.