Working example for https://github.com/elasticsearch/elasticsearch/issues/2674

terms-filter-lookup.sh

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

# index a tweet, from user with id 2
curl -XPUT localhost:9200/tweets/tweet/1 -d '{
   "user" : "1",
   "tweet" : "hi i am user 1 "
}'

# index a tweet, from user with id 2
curl -XPUT localhost:9200/tweets/tweet/2 -d '{
   "user" : "2",
   "tweet" : "hi i am user 2 "
}'

# index a tweet, from user with id 2
curl -XPUT localhost:9200/tweets/tweet/3 -d '{
   "user" : "3",
   "tweet" : "hi i am user 3 "
}'


curl -XPOST localhost:9200/_refresh

# search on all the tweets that match the friends of user 2
curl -XGET localhost:9200/tweets/_search?pretty=true -d '{
  "query" : {
    "filtered" : {
        "filter" : {
            "terms" : {
                "user" : {
                    "index" : "users",
                    "type" : "user",
                    "id" : "2",
                    "path" : "friends"
                },
                "_cache_key" : "user_2_friends"
            }
        }
    }
  }
}'

# returns
#"hits" : {
#    "total" : 2,
#    "max_score" : 1.0,
#    "hits" : [ {
#      "_index" : "tweets",
#      "_type" : "tweet",
#      "_id" : "1",
#      "_score" : 1.0, "_source" : {
#   "user" : "1",
#   "tweet" : "hi i am user 1 "
#}
#    }, {
#      "_index" : "tweets",
#      "_type" : "tweet",
#      "_id" : "3",
#      "_score" : 1.0, "_source" : {
#   "user" : "3",
#   "tweet" : "hi i am user 3 "
#}
#    } ]
#  }