Simple tag cloud with ElasticSearch `terms` facet

tagcloud.sh

# (Re)create the index
curl -X DELETE "http://localhost:9200/tagcloud"
curl -X PUT    "http://localhost:9200/tagcloud"-d '{
  "settings" : {
    "index" : {
      "number_of_shards"   : 1,
      "number_of_replicas" : 0
    }
  }
}'

# Insert the data
curl -X POST "http://localhost:9200/tagcloud/document" -d '{ "body" : "Ruby is a dynamic, reflective, general-purpose object-oriented programming language that combines syntax inspired by Perl with Smalltalk-like features. Ruby originated in Japan during the mid-1990s and was first developed and designed by Yukihiro \"Matz\" Matsumoto. It was influenced primarily by Perl, Smalltalk, Eiffel, and Lisp." }'

curl -X POST "http://localhost:9200/tagcloud/document" -d '{ "body" : "Erlang is a general-purpose concurrent, garbage-collected programming language and runtime system. The sequential subset of Erlang is a functional language, with strict evaluation, single assignment, and dynamic typing. For concurrency it follows the Actor model. It was designed by Ericsson to support distributed, fault-tolerant, soft-real-time, non-stop applications. It supports hot swapping, thus code can be changed without stopping a system." }'

curl -X POST "http://localhost:9200/tagcloud/document" -d '{ "body" : "JavaScript, also known as ECMAScript, is a prototype-based, object-oriented scripting language that is dynamic, weakly typed and has first-class functions. It is also considered a functional programming language like Scheme and OCaml because it has closures and supports higher-order functions." }'

curl -X POST "http://localhost:9200/tagcloud/_refresh"

# Queries
curl -X POST "http://localhost:9200/tagcloud/_search?search_type=count&pretty=true" -d '
{
    "query" : {
      "match_all" : {}
    },

    "facets" : {
        "tagcloud" : {
            "terms" : { "field" : "body", "size" : 25  }
        }
    }
}'

Nice snippet ! Is there a way to remove some words (such as "also", "a", "is" ....) ?

Yes, it is possible to specify a set of terms that should be excluded from the terms facet request result

{
"query" : {
"match_all" : { }
},
"facets" : {
"tagcloud" : {
"terms" : {
"field" : "body",
"exclude" : ["a", "also", . . . ]
}
}
}
}

Check the doc -> http://www.elasticsearch.org/guide/reference/api/search/facets/terms-facet.html

Note to future searchers that facets are deprecated in favor of aggregations as shown in the documentation