229 lines
6.8 KiB
Plaintext
229 lines
6.8 KiB
Plaintext
[[search-request-body]]
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== Request Body Search
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The search request can be executed with a search DSL, which includes the
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<<query-dsl,Query DSL>>, within its body. Here is an
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example:
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[source,js]
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--------------------------------------------------
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GET /twitter/_search
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{
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"query" : {
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"term" : { "user" : "kimchy" }
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}
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}
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:twitter]
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And here is a sample response:
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[source,js]
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--------------------------------------------------
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{
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"took": 1,
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"timed_out": false,
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"_shards":{
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"total" : 1,
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"successful" : 1,
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"skipped" : 0,
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"failed" : 0
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},
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"hits":{
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"total" : {
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"value": 1,
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"relation": "eq"
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},
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"max_score": 1.3862944,
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"hits" : [
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{
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"_index" : "twitter",
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"_type" : "_doc",
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"_id" : "0",
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"_score": 1.3862944,
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"_source" : {
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"user" : "kimchy",
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"message": "trying out Elasticsearch",
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"date" : "2009-11-15T14:12:12",
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"likes" : 0
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}
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}
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]
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}
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}
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--------------------------------------------------
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// TESTRESPONSE[s/"took": 1/"took": $body.took/]
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[float]
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=== Parameters
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[horizontal]
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`timeout`::
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A search timeout, bounding the search request to be executed within the
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specified time value and bail with the hits accumulated up to that point
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when expired. Search requests are canceled after the timeout is reached using
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the <<global-search-cancellation>> mechanism.
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Defaults to no timeout. See <<time-units>>.
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`from`::
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To retrieve hits from a certain offset. Defaults to `0`.
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`size`::
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The number of hits to return. Defaults to `10`. If you do not care about
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getting some hits back but only about the number of matches and/or
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aggregations, setting the value to `0` will help performance.
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`search_type`::
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The type of the search operation to perform. Can be
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`dfs_query_then_fetch` or `query_then_fetch`.
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Defaults to `query_then_fetch`.
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See <<search-request-search-type,_Search Type_>> for more.
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`request_cache`::
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Set to `true` or `false` to enable or disable the caching
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of search results for requests where `size` is 0, ie
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aggregations and suggestions (no top hits returned).
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See <<shard-request-cache>>.
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`allow_partial_search_results`::
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Set to `false` to return an overall failure if the request would produce partial
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results. Defaults to true, which will allow partial results in the case of timeouts
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or partial failures. This default can be controlled using the cluster-level setting
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`search.default_allow_partial_results`.
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`terminate_after`::
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The maximum number of documents to collect for each shard,
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upon reaching which the query execution will terminate early. If set, the
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response will have a boolean field `terminated_early` to indicate whether
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the query execution has actually terminated_early. Defaults to no
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terminate_after.
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`batched_reduce_size`::
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The number of shard results that should be reduced at once on the
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coordinating node. This value should be used as a protection mechanism to
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reduce the memory overhead per search request if the potential number of
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shards in the request can be large.
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Out of the above, the `search_type`, `request_cache` and the `allow_partial_search_results`
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settings must be passed as query-string parameters. The rest of the search request should
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be passed within the body itself. The body content can also be passed as a REST
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parameter named `source`.
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Both HTTP GET and HTTP POST can be used to execute search with body. Since not
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all clients support GET with body, POST is allowed as well.
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[float]
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=== Fast check for any matching docs
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NOTE: `terminate_after` is always applied **after** the `post_filter` and stops
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the query as well as the aggregation executions when enough hits have been
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collected on the shard. Though the doc count on aggregations may not reflect
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the `hits.total` in the response since aggregations are applied **before** the
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post filtering.
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In case we only want to know if there are any documents matching a
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specific query, we can set the `size` to `0` to indicate that we are not
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interested in the search results. Also we can set `terminate_after` to `1`
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to indicate that the query execution can be terminated whenever the first
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matching document was found (per shard).
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[source,js]
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--------------------------------------------------
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GET /_search?q=message:number&size=0&terminate_after=1
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:twitter]
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The response will not contain any hits as the `size` was set to `0`. The
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`hits.total` will be either equal to `0`, indicating that there were no
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matching documents, or greater than `0` meaning that there were at least
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as many documents matching the query when it was early terminated.
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Also if the query was terminated early, the `terminated_early` flag will
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be set to `true` in the response.
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[source,js]
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--------------------------------------------------
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{
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"took": 3,
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"timed_out": false,
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"terminated_early": true,
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"_shards": {
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"total": 1,
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"successful": 1,
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"skipped" : 0,
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"failed": 0
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},
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"hits": {
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"total" : {
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"value": 1,
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"relation": "eq"
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},
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"max_score": null,
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"hits": []
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}
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}
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--------------------------------------------------
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// TESTRESPONSE[s/"took": 3/"took": $body.took/]
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The `took` time in the response contains the milliseconds that this request
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took for processing, beginning quickly after the node received the query, up
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until all search related work is done and before the above JSON is returned
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to the client. This means it includes the time spent waiting in thread pools,
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executing a distributed search across the whole cluster and gathering all the
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results.
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include::request/query.asciidoc[]
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include::request/from-size.asciidoc[]
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include::request/sort.asciidoc[]
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include::request/track-total-hits.asciidoc[]
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include::request/source-filtering.asciidoc[]
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include::request/stored-fields.asciidoc[]
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include::request/script-fields.asciidoc[]
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include::request/docvalue-fields.asciidoc[]
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include::request/post-filter.asciidoc[]
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include::request/highlighting.asciidoc[]
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include::request/rescore.asciidoc[]
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include::request/search-type.asciidoc[]
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include::request/scroll.asciidoc[]
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include::request/preference.asciidoc[]
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include::request/explain.asciidoc[]
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include::request/version.asciidoc[]
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include::request/index-boost.asciidoc[]
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include::request/min-score.asciidoc[]
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include::request/named-queries-and-filters.asciidoc[]
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include::request/inner-hits.asciidoc[]
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include::request/collapse.asciidoc[]
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include::request/search-after.asciidoc[]
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