How return document from elasticsearch after update?

Question

I am trying to update several document fields and return full document after update. I use elastic4s 1.3.4, elasticsearch 1.4.3 (as server).

Here is a code:

import scala.concurrent.ExecutionContext.Implicits.global
object ElasticsearchTester extends App {
  private val settings: Settings = ImmutableSettings.settingsBuilder().put("cluster.name", "clustername").build()
  private val client: ElasticClient = ElasticClient.remote(settings, ("localhost", 9300))

  val initial = """
    |{
    |   "name":"jojn",
    |   "surname":"olol"
    |}
  """.stripMargin

  val updateString = """
    |{
    |   "surname":"123",
    |   "global": {
    |     "new":"fiedl"
    |   }
    |}
  """.stripMargin

  import com.sksamuel.elastic4s.ElasticDsl._
  val future = client.execute {
    create index "my_index"
  }.flatMap { r=>
    client.execute {
      index into "my_index/user" doc StringDocumentSource(initial)
    }.flatMap { re=>
      println("Ololo indexed is: " + initial)
      println("Ololo indexed id: " + re.getId)
      client.execute {
        update id re.getId in "my_index/user" doc StringDocumentSource(updateString) docAsUpsert true params  ("fields" -> "_source")
      }.map{res=>
        println("Ololo result is: " + res.getGetResult.sourceAsString())

      }
    }
  }

  Await.result (future, 20.seconds)
  println("Ololo ok")
}

Why I get NullPointerException in line res.getGetResult.sourceAsString() ? It seems that update response do not contains a document after update operation. Is it possible to return document _source from update response?

Answer 1

Elastic4s seem has no api in UpdateDefinition (for now 23.07.2015) to set fields. However it's builder support this operation, the code below is like dirty hack, but it works as exepcted, just set fields directly into _builder :

val updateRequest = update id re.getId in "my_index/user" doc StringDocumentSource(updateString) docAsUpsert true
updateRequest._builder.setFields("_source")
client.execute {
    updateRequest
    }.map { res=>
        println("Ololo result is: " + res.getGetResult.sourceAsString())
    }
}

prints

Ololo indexed id: AU66n1yiYVxOgU2h4AoG
Ololo result is: {"name":"jojn","surname":"123","global":{"new":"fiedl"}}
Ololo ok

Note

Elasticsearch does support returning fields after update request.

Updated

Elastic4s after this commit support this via UpdateDsl.includeSource or UpdateDsl.setFields methods.