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elastic4s を試す

Posted at

Elasticsearch 用のscala バインディングを探していて、elastic4s 触った記録。

他にもあるが このなかであげられてる中では一番☆が多かった。

試す

build.sbt にこれだけ書いてsbt console起動。

libraryDependencies ++= Seq(
  "com.sksamuel.elastic4s" %% "elastic4s" % "1.2.1.2"
)

まずパッケージをインポート

scala> import com.sksamuel.elastic4s.ElasticClient
import com.sksamuel.elastic4s.ElasticClient

scala> import com.sksamuel.elastic4s.ElasticDsl._
import com.sksamuel.elastic4s.ElasticDsl._

てか、そもそもElasticsearchが動いてないじゃんってことでdocker repoから適当なのを取ってくる、

$ docker pull dockerfile/elasticsearch
...
$ docker run -d -p 9200:9200 -p 9300:9300 dockerfile/elasticsearch

はい。

sbt consoleに戻ってESとつなげる。

scala > val cl = Elaticsearch.local
cl: com.sksamuel.elastic4s.ElasticClient = com.sksamuel.elastic4s.ElasticClient@619fc958
// val cl = Elaticsearch.remote("remote", 9300) // リモートの場合

インデックスの作成

scala> cl.execute{ create index "tweets" }
res0: scala.concurrent.Future[org.elasticsearch.action.admin.indices.create.CreateIndexResponse] = scala.concurrent.impl.Promise$DefaultPromise@16f91928

見て分かる通り全部Futureで返ってくる。

インデックス

scala> val f =cl.execute{ index into "tweets" fields ("text"->"helloworld","user"->"iwag")  }
f: scala.concurrent.Future[org.elasticsearch.action.index.IndexResponse] = scala.concurrent.impl.Promise$DefaultPromise@26ae2063

サーチ

scala> val f =cl.execute{ search in "tweets" }
f: scala.concurrent.Future[org.elasticsearch.action.search.SearchResponse] = scala.concurrent.impl.Promise$DefaultPromise@3ade8076

サーチ返ってくるのがESのJavaなSearchResponseでだるい。

scala> f.value.get.get
res1: org.elasticsearch.action.search.SearchResponse =
{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 7,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "tweets",
      "_type" : "test",
      "_id" : "KGWbDEY7Q66PFDnDeFmdpA",
      "_score" : 1.0,
      "_source":{"text":"hello world","user":"iwag"}
    }
  }
}
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