Search APIs edit

Most search APIs are multi-index, multi-type, with the exception of the Explain API endpoints.

Routingedit

When executing a search, it will be broadcast to all the index/indices shards (round robin between replicas). Which shards will be searched on can be controlled by providing the routing parameter. For example, when indexing tweets, the routing value can be the user name:

$ curl -XPOST 'http://localhost:9200/twitter/tweet?routing=kimchy' -d '{
    "user" : "kimchy",
    "postDate" : "2009-11-15T14:12:12",
    "message" : "trying out Elasticsearch"
}
'

In such a case, if we want to search only on the tweets for a specific user, we can specify it as the routing, resulting in the search hitting only the relevant shard:

$ curl -XGET 'http://localhost:9200/twitter/tweet/_search?routing=kimchy' -d '{
    "query": {
        "bool" : {
            "must" : {
                "query_string" : {
                    "query" : "some query string here"
                }
            },
            "filter" : {
                "term" : { "user" : "kimchy" }
            }
        }
    }
}
'

The routing parameter can be multi valued represented as a comma separated string. This will result in hitting the relevant shards where the routing values match to.

Stats Groupsedit

A search can be associated with stats groups, which maintains a statistics aggregation per group. It can later be retrieved using the indices stats API specifically. For example, here is a search body request that associate the request with two different groups:

{
    "query" : {
        "match_all" : {}
    },
    "stats" : ["group1", "group2"]
}

Global Search Timeoutedit

Individual searches can have a timeout as part of the Request Body Search. Since search requests can originate from many sources, Elasticsearch has a dynamic cluster-level setting for a global search timeout that applies to all search requests that do not set a timeout in the Request Body Search. The default value is no global timeout. The setting key is search.default_search_timeout and can be set using the Cluster Update Settings endpoints. Setting this value to -1 resets the global search timeout to no timeout.