109 lines
3.2 KiB
Plaintext
109 lines
3.2 KiB
Plaintext
[[search-count]]
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== Count API
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The count API allows to easily execute a query and get the number of
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matches for that query. It can be executed across one or more indices.
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The query can either be provided using a simple query string as a
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parameter, or using the <<query-dsl,Query DSL>> defined within the request
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body. Here is an example:
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[source,js]
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--------------------------------------------------
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PUT /twitter/_doc/1?refresh
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{
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"user": "kimchy"
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}
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GET /twitter/_doc/_count?q=user:kimchy
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GET /twitter/_doc/_count
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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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NOTE: The query being sent in the body must be nested in a `query` key, same as
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the <<search-search,search api>> works
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Both examples above do the same thing, which is count the number of
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tweets from the `twitter` index for a certain user. The result is:
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[source,js]
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--------------------------------------------------
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{
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"count" : 1,
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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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}
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--------------------------------------------------
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// TESTRESPONSE
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The query is optional, and when not provided, it will use `match_all` to
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count all the docs.
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[float]
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=== Multi index
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The count API can be applied to <<search-multi-index,multiple indices>>.
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[float]
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=== Request Parameters
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When executing count using the query parameter `q`, the query passed is
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a query string using Lucene query parser. There are additional
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parameters that can be passed:
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[cols="<,<",options="header",]
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|=======================================================================
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|Name |Description
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|`df` |The default field to use when no field prefix is defined within the
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query.
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|`analyzer` |The analyzer name to be used when analyzing the query string.
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|`default_operator` |The default operator to be used, can be `AND` or
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`OR`. Defaults to `OR`.
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|`lenient` |If set to true will cause format based failures (like
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providing text to a numeric field) to be ignored. Defaults to false.
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|`analyze_wildcard` |Should wildcard and prefix queries be analyzed or
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not. Defaults to `false`.
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|`terminate_after` |The maximum count for each shard, upon
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reaching which the query execution will terminate early.
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If set, the response will have a boolean field `terminated_early` to
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indicate whether the query execution has actually terminated_early.
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Defaults to no terminate_after.
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|=======================================================================
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[float]
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=== Request Body
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The count can use the <<query-dsl,Query DSL>> within
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its body in order to express the query that should be executed. The body
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content can also be passed as a REST parameter named `source`.
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Both HTTP GET and HTTP POST can be used to execute count with body.
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Since not all clients support GET with body, POST is allowed as well.
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[float]
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=== Distributed
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The count operation is broadcast across all shards. For each shard id
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group, a replica is chosen and executed against it. This means that
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replicas increase the scalability of count.
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[float]
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=== Routing
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The routing value (a comma separated list of the routing values) can be
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specified to control which shards the count request will be executed on.
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