88 lines
3.5 KiB
Plaintext
88 lines
3.5 KiB
Plaintext
[[breaking_60_search_changes]]
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=== Search and Query DSL changes
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==== Changes to queries
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* The `collect_payloads` parameter of the `span_near` query has been removed. Payloads will be
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loaded when needed.
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* Queries on boolean fields now strictly parse boolean-like values. This means
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only the strings `"true"` and `"false"` will be parsed into their boolean
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counterparts. Other strings will cause an error to be thrown.
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* The `in` query (a synonym for the `terms` query) has been removed
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* The `geo_bbox` query (a synonym for the `geo_bounding_box` query) has been removed
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* The `mlt` query (a synonym for the `more_like_this` query) has been removed
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* The `fuzzy_match` and `match_fuzzy` query (synonyma for the `match` query) have been removed
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* The `terms` query now always returns scores equal to `1` and is not subject to
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`indices.query.bool.max_clause_count` anymore.
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* The deprecated `indices` query has been removed.
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* Support for empty query objects (`{ }`) has been removed from the query DSL.
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An error is thrown whenever an empty query object is provided.
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* The deprecated `minimum_number_should_match` parameter in the `bool` query has
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been removed, use `minimum_should_match` instead.
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* The `query_string` query now correctly parses the maximum number of
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states allowed when
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"https://en.wikipedia.org/wiki/Powerset_construction#Complexity[determinizing]"
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a regex as `max_determinized_states` instead of the typo
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`max_determined_states`.
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* The `query_string` query no longer accepts `enable_position_increment`, use
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`enable_position_increments` instead.
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* For `geo_distance` queries, sorting, and aggregations the `sloppy_arc` option
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has been removed from the `distance_type` parameter.
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* The `geo_distance_range` query, which was deprecated in 5.0, has been removed.
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* The `optimize_bbox` parameter has been removed from `geo_distance` queries.
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* The `ignore_malformed` and `coerce` parameters have been removed from
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`geo_bounding_box`, `geo_polygon`, and `geo_distance` queries.
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==== Search shards API
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The search shards API no longer accepts the `type` url parameter, which didn't
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have any effect in previous versions.
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==== Changes to the Profile API
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* The `"time"` field showing human readable timing output has been replaced by the `"time_in_nanos"`
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field which displays the elapsed time in nanoseconds. The `"time"` field can be turned on by adding
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`"?human=true"` to the request url. It will display a rounded, human readable time value.
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==== Scoring changes
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===== Query normalization
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Query normalization has been removed. This means that the TF-IDF similarity no
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longer tries to make scores comparable across queries and that boosts are now
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integrated into scores as simple multiplicative factors.
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Other similarities are not affected as they did not normalize scores and
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already integrated boosts into scores as multiplicative factors.
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See https://issues.apache.org/jira/browse/LUCENE-7347[`LUCENE-7347`] for more
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information.
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===== Coordination factors
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Coordination factors have been removed from the scoring formula. This means that
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boolean queries no longer score based on the number of matching clauses.
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Instead, they always return the sum of the scores of the matching clauses.
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As a consequence, use of the TF-IDF similarity is now discouraged as this was
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an important component of the quality of the scores that this similarity
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produces. BM25 is recommended instead.
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See https://issues.apache.org/jira/browse/LUCENE-7347[`LUCENE-7347`] for more
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information.
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