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Terms Query

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Terms Query

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Filters documents that have fields that match any of the provided terms (not analyzed). For example:

{
    "constant_score" : {
        "filter" : {
            "terms" : { "user" : ["kimchy", "elasticsearch"]}
        }
    }
}

The terms query is also aliased with in as the filter name for simpler usage.

Terms lookup mechanism

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When it’s needed to specify a terms filter with a lot of terms it can be beneficial to fetch those term values from a document in an index. A concrete example would be to filter tweets tweeted by your followers. Potentially the amount of user ids specified in the terms filter can be a lot. In this scenario it makes sense to use the terms filter’s terms lookup mechanism.

The terms lookup mechanism supports the following options:

`index`	The index to fetch the term values from. Defaults to the current index.
`type`	The type to fetch the term values from.
`id`	The id of the document to fetch the term values from.
`path`	The field specified as path to fetch the actual values for the `terms` filter.
`routing`	A custom routing value to be used when retrieving the external terms doc.

The values for the terms filter will be fetched from a field in a document with the specified id in the specified type and index. Internally a get request is executed to fetch the values from the specified path. At the moment for this feature to work the _source needs to be stored.

Also, consider using an index with a single shard and fully replicated across all nodes if the "reference" terms data is not large. The lookup terms filter will prefer to execute the get request on a local node if possible, reducing the need for networking.

Terms lookup twitter example

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# index the information for user with id 2, specifically, its followers
curl -XPUT localhost:9200/users/user/2 -d '{
   "followers" : ["1", "3"]
}'

# index a tweet, from user with id 1
curl -XPUT localhost:9200/tweets/tweet/1 -d '{
   "user" : "1"
}'

# search on all the tweets that match the followers of user 2
curl -XGET localhost:9200/tweets/_search -d '{
  "query" : {
    "terms" : {
      "user" : {
        "index" : "users",
        "type" : "user",
        "id" : "2",
        "path" : "followers"
      }
    }
  }
}'

The structure of the external terms document can also include array of inner objects, for example:

curl -XPUT localhost:9200/users/user/2 -d '{
 "followers" : [
   {
     "id" : "1"
   },
   {
     "id" : "2"
   }
 ]
}'

In which case, the lookup path will be followers.id.

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