Filters documents that have fields that contain a term (not analyzed). Similar to term query, except that it acts as a filter. Can be placed within queries that accept a filter, for example:

{
    "constant_score" : {
        "filter" : {
            "term" : { "user" : "kimchy"}
        }
    }
}

Cachingedit

The result of the filter is automatically cached by default. The _cache can be set to false to turn it off. Here is an example:

{
    "constant_score" : {
        "filter" : {
            "term" : {
                "user" : "kimchy",
                "_cache" : false
            }
        }
    }
}