39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
[[count]]
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== Count API
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The count API allows one 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 be provided using the
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{ref}/query-dsl.html[Query DSL].
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[source,java]
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--------------------------------------------------
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import static org.elasticsearch.index.query.FilterBuilders.*;
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import static org.elasticsearch.index.query.QueryBuilders.*;
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CountResponse response = client.prepareCount("test")
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.setQuery(termQuery("_type", "type1"))
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.execute()
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.actionGet();
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--------------------------------------------------
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For more information on the count operation, check out the REST
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{ref}/search-count.html[count] docs.
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=== Operation Threading
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The count API allows one to set the threading model the operation will be
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performed when the actual execution of the API is performed on the same
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node (the API is executed on a shard that is allocated on the same
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server).
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There are three threading modes.The `NO_THREADS` mode means that the
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count operation will be executed on the calling thread. The
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`SINGLE_THREAD` mode means that the count operation will be executed on
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a single different thread for all local shards. The `THREAD_PER_SHARD`
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mode means that the count operation will be executed on a different
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thread for each local shard.
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The default mode is `SINGLE_THREAD`.
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