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"}
}
}
}
The result of the filter is automatically cached by default. The _cache can be set to false to turn it off.