151 lines
5.8 KiB
Plaintext
151 lines
5.8 KiB
Plaintext
[float]
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[[breaking_70_search_changes]]
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=== Search and Query DSL changes
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[float]
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==== Changes to queries
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* The default value for `transpositions` parameter of `fuzzy` query
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has been changed to `true`.
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* The `query_string` options `use_dismax`, `split_on_whitespace`,
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`all_fields`, `locale`, `auto_generate_phrase_query` and
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`lowercase_expanded_terms` deprecated in 6.x have been removed.
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* Purely negative queries (only MUST_NOT clauses) now return a score of `0`
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rather than `1`.
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* The boundary specified using geohashes in the `geo_bounding_box` query
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now include entire geohash cell, instead of just geohash center.
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* Attempts to generate multi-term phrase queries against non-text fields
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with a custom analyzer will now throw an exception
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* An `envelope` crossing the dateline in a `geo_shape `query is now processed
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correctly when specified using REST API instead of having its left and
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right corners flipped.
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[float]
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==== Adaptive replica selection enabled by default
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Adaptive replica selection has been enabled by default. If you wish to return to
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the older round robin of search requests, you can use the
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`cluster.routing.use_adaptive_replica_selection` setting:
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[source,js]
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--------------------------------------------------
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PUT /_cluster/settings
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{
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"transient": {
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"cluster.routing.use_adaptive_replica_selection": false
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}
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}
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--------------------------------------------------
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// CONSOLE
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[float]
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==== Search API returns `400` for invalid requests
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The Search API returns `400 - Bad request` while it would previously return
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`500 - Internal Server Error` in the following cases of invalid request:
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* the result window is too large
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* sort is used in combination with rescore
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* the rescore window is too large
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* the number of slices is too large
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* keep alive for scroll is too large
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* number of filters in the adjacency matrix aggregation is too large
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* script compilation errors
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[float]
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==== Scroll queries cannot use the `request_cache` anymore
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Setting `request_cache:true` on a query that creates a scroll (`scroll=1m`)
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has been deprecated in 6 and will now return a `400 - Bad request`.
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Scroll queries are not meant to be cached.
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[float]
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==== Scroll queries cannot use `rescore` anymore
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Including a rescore clause on a query that creates a scroll (`scroll=1m`) has
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been deprecated in 6.5 and will now return a `400 - Bad request`. Allowing
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rescore on scroll queries would break the scroll sort. In the 6.x line, the
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rescore clause was silently ignored (for scroll queries), and it was allowed in
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the 5.x line.
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[float]
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==== Term Suggesters supported distance algorithms
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The following string distance algorithms were given additional names in 6.2 and
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their existing names were deprecated. The deprecated names have now been
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removed.
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* `levenstein` - replaced by `levenshtein`
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* `jarowinkler` - replaced by `jaro_winkler`
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[float]
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==== `popular` mode for Suggesters
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The `popular` mode for Suggesters (`term` and `phrase`) now uses the doc frequency
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(instead of the sum of the doc frequency) of the input terms to compute the frequency
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threshold for candidate suggestions.
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[float]
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==== Limiting the number of terms that can be used in a Terms Query request
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Executing a Terms Query with a lot of terms may degrade the cluster performance,
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as each additional term demands extra processing and memory.
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To safeguard against this, the maximum number of terms that can be used in a
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Terms Query request has been limited to 65536. This default maximum can be changed
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for a particular index with the index setting `index.max_terms_count`.
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[float]
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==== Limiting the length of regex that can be used in a Regexp Query request
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Executing a Regexp Query with a long regex string may degrade search performance.
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To safeguard against this, the maximum length of regex that can be used in a
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Regexp Query request has been limited to 1000. This default maximum can be changed
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for a particular index with the index setting `index.max_regex_length`.
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[float]
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==== Limiting the number of auto-expanded fields
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Executing queries that use automatic expansion of fields (e.g. `query_string`, `simple_query_string`
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or `multi_match`) can have performance issues for indices with a large numbers of fields.
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To safeguard against this, a hard limit of 1024 fields has been introduced for queries
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using the "all fields" mode ("default_field": "*") or other fieldname expansions (e.g. "foo*").
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[float]
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==== Invalid `_search` request body
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Search requests with extra content after the main object will no longer be accepted
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by the `_search` endpoint. A parsing exception will be thrown instead.
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[float]
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==== Context Completion Suggester
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The ability to query and index context enabled suggestions without context,
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deprecated in 6.x, has been removed. Context enabled suggestion queries
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without contexts have to visit every suggestion, which degrades the search performance
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considerably.
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For geo context the value of the `path` parameter is now validated against the mapping,
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and the context is only accepted if `path` points to a field with `geo_point` type.
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[float]
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==== Semantics changed for `max_concurrent_shard_requests`
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`max_concurrent_shard_requests` used to limit the total number of concurrent shard
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requests a single high level search request can execute. In 7.0 this changed to be the
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max number of concurrent shard requests per node. The default is now `5`.
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[float]
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==== `max_score` set to `null` when scores are not tracked
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`max_score` used to be set to `0` whenever scores are not tracked. `null` is now used
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instead which is a more appropriate value for a scenario where scores are not available.
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[float]
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==== Negative boosts are not allowed
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Setting a negative `boost` in a query, deprecated in 6x, are not allowed in this version.
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To deboost a specific query you can use a `boost` comprise between 0 and 1. |