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Count API

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Count API

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The count API allows to easily execute a query and get the number of matches for that query. It can be executed across one or more indices and across one or more types. The query can either be provided using a simple query string as a parameter, or using the Query DSL defined within the request body. Here is an example:

$ curl -XGET 'http://localhost:9200/twitter/tweet/_count?q=user:kimchy'

$ curl -XGET 'http://localhost:9200/twitter/tweet/_count' -d '
{
    "query" : {
        "term" : { "user" : "kimchy" }
    }
}'

The query being sent in the body must be nested in a query key, same as the search api works

Both examples above do the same thing, which is count the number of tweets from the twitter index for a certain user. The result is:

{
    "count" : 1,
    "_shards" : {
        "total" : 5,
        "successful" : 5,
        "failed" : 0
    }
}

The query is optional, and when not provided, it will use match_all to count all the docs.

Multi index, Multi type

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The count API can be applied to multiple types in multiple indices.

Request Parameters

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When executing count using the query parameter q, the query passed is a query string using Lucene query parser. There are additional parameters that can be passed:

Name	Description
df	The default field to use when no field prefix is defined within the query.
analyzer	The analyzer name to be used when analyzing the query string.
default_operator	The default operator to be used, can be `AND` or `OR`. Defaults to `OR`.
terminate_after	[preview] This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features. The maximum count for each shard, upon reaching which the query execution will terminate early. If set, the response will have a boolean field `terminated_early` to indicate whether the query execution has actually terminated_early. Defaults to no terminate_after.

Request Body

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The count can use the Query DSL within its body in order to express the query that should be executed. The body content can also be passed as a REST parameter named source.

Both HTTP GET and HTTP POST can be used to execute count with body. Since not all clients support GET with body, POST is allowed as well.

Distributed

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The count operation is broadcast across all shards. For each shard id group, a replica is chosen and executed against it. This means that replicas increase the scalability of count.

Routing

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The routing value (a comma separated list of the routing values) can be specified to control which shards the count request will be executed on.

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