86 lines
2.6 KiB
Plaintext
86 lines
2.6 KiB
Plaintext
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[[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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and across one or more types. The query can either be provided using a
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simple query string as a parameter, or using the
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<<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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$ curl -XGET 'http://localhost:9200/twitter/tweet/_count?q=user:kimchy'
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$ curl -XGET 'http://localhost:9200/twitter/tweet/_count' -d '
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{
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"term" : { "user" : "kimchy" }
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}'
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--------------------------------------------------
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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" : 5,
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"successful" : 5,
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"failed" : 0
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}
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}
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--------------------------------------------------
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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, Multi type
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The count API can be applied to <<search-multi-index-type,multiple types in 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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|=======================================================================
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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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