144 lines
4.4 KiB
Plaintext
144 lines
4.4 KiB
Plaintext
[[breaking_50_search_changes]]
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=== Search and Query DSL changes
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==== `search_type`
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===== `search_type=count` removed
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The `count` search type was deprecated since version 2.0.0 and is now removed.
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In order to get the same benefits, you just need to set the value of the `size`
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parameter to `0`.
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For instance, the following request:
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[source,sh]
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---------------
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GET /my_index/_search?search_type=count
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{
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"aggs": {
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"my_terms": {
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"terms": {
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"field": "foo"
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}
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}
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}
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}
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---------------
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can be replaced with:
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[source,sh]
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---------------
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GET /my_index/_search
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{
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"size": 0,
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"aggs": {
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"my_terms": {
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"terms": {
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"field": "foo"
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}
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}
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}
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}
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---------------
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===== `search_type=scan` removed
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The `scan` search type was deprecated since version 2.1.0 and is now removed.
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All benefits from this search type can now be achieved by doing a scroll
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request that sorts documents in `_doc` order, for instance:
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[source,sh]
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---------------
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GET /my_index/_search?scroll=2m
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{
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"sort": [
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"_doc"
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]
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}
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---------------
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Scroll requests sorted by `_doc` have been optimized to more efficiently resume
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from where the previous request stopped, so this will have the same performance
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characteristics as the former `scan` search type.
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==== `fields` parameter
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The `fields` parameter used to try to retrieve field values from stored
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fields, and fall back to extracting from the `_source` if a field is not
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marked as stored. Now, the `fields` parameter will only return stored fields
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-- it will no longer extract values from the `_source`.
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==== search-exists API removed
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The search exists api has been removed in favour of using the search api with
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`size` set to `0` and `terminate_after` set to `1`.
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==== Deprecated queries removed
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The following deprecated queries have been removed:
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`filtered`:: Use `bool` query instead, which supports `filter` clauses too.
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`and`:: Use `must` clauses in a `bool` query instead.
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`or`:: Use `should` clauses in a `bool` query instead.
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`limit`:: Use the `terminate_after` parameter instead.
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`fquery`:: Is obsolete after filters and queries have been merged.
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`query`:: Is obsolete after filters and queries have been merged.
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`query_binary`:: Was undocumented and has been removed.
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`filter_binary`:: Was undocumented and has been removed.
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==== Changes to queries
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* Removed support for the deprecated `min_similarity` parameter in `fuzzy
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query`, in favour of `fuzziness`.
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* Removed support for the deprecated `fuzzy_min_sim` parameter in
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`query_string` query, in favour of `fuzziness`.
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* Removed support for the deprecated `edit_distance` parameter in completion
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suggester, in favour of `fuzziness`.
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* Removed support for the deprecated `filter` and `no_match_filter` fields in `indices` query,
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in favour of `query` and `no_match_query`.
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* Removed support for the deprecated `filter` fields in `nested` query, in favour of `query`.
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* Removed support for the deprecated `minimum_should_match` and
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`disable_coord` in `terms` query, use `bool` query instead. Also removed
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support for the deprecated `execution` parameter.
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* Removed support for the top level `filter` element in `function_score` query, replaced by `query`.
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* The `collect_payloads` parameter of the `span_near` query has been deprecated. Payloads will be loaded when needed.
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* The `score_type` parameter to the `nested`, has_child` and `has_parent` queries has been removed in favour of `score_mode`.
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Also, the `total` score mode has been removed in favour of the `sum` mode.
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* When the `max_children` parameter was set to `0` on the `has_child` query
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then there was no upper limit on how many child documents were allowed to
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match. Now, `0` really means that zero child documents are allowed. If no
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upper limit is needed then the `max_children` parameter shouldn't be specified
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at all.
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* The `exists` query will now fail if the `_field_names` field is disabled.
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==== Top level `filter` parameter
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Removed support for the deprecated top level `filter` in the search api,
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replaced by `post_filter`.
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==== Highlighters
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Removed support for multiple highlighter names, the only supported ones are:
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`plain`, `fvh` and `postings`.
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==== Term vectors API
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The term vectors APIs no longer persist unmapped fields in the mappings.
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The `dfs` parameter to the term vectors API has been removed completely. Term
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vectors don't support distributed document frequencies anymore.
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