如何在Elasticsearch中检索嵌套的文档和数组值

Question

I have a following document

{
  "_index" : "Testdb",
  "_type" : "artWork",
  "_id" : "0",
  "_version" : 1,
  "found" : true,
  "_source":{"uuid":0,"ArtShare":{"TotalArtShares":0,"pricePerShare":0,"ArtworkUuid":12,"AvailableShares":0,"SoldShares":0},"StatusHistoryList":[{"ArtWorkDate":"2015-08-26T13:20:17.725+05:00","ArtworkStatus":"ACTIVE"}]}
}

i want to access/retrieve the value of ArtShare and its attributes and values of array StatusHistoryList

i am doing like this

val get=client.prepareGet("Testdb","artWork",Id.toString())
        .setOperationThreaded(false)
        .setFields("uuid","ArtShare","StatusHistoryList"
            )
        .execute()
        .actionGet()
        if(get.isExists())
        {
        uuid=get.getField("uuid").getValue.toString().toInt
       //how to fetch `artShare` whole nested document and array elements `StatusHistoryListof`  
     }

UPDATE if i do this

 val get=client.prepareGet("Testdb","artWork",Id.toString())
            .setOperationThreaded(false)
            .setFields("uuid","ArtShare","StatusHistoryList"
                ,"_source","ArtShare.TotalArtShares")
            .execute()
            .actionGet()
            if(get.isExists())
            {
            uuid=get.getField("uuid").getValue.toString().toInt
           var totalShares= get.getField("ArtShare.TotalArtShares").getValue.toString().toInt 
         }

then following exception thrown

org.elasticsearch.ElasticsearchIllegalArgumentException: field [ArtShare] isn't a leaf field
    at org.elasticsearch.index.get.ShardGetService.innerGetLoadFromStoredFields(ShardGetService.java:368)
    at org.elasticsearch.index.get.ShardGetService.innerGet(ShardGetService.java:210)
    at org.elasticsearch.index.get.ShardGetService.get(ShardGetService.java:104)
    at org.elasticsearch.action.get.TransportGetAction.shardOperation(TransportGetAction.java:104)
    at org.elasticsearch.action.get.TransportGetAction.shardOperation(TransportGetAction.java:44)
    at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$ShardTransportHandler.messageReceived(TransportShardSingleOperationAction.java:297)
    at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$ShardTransportHandler.messageReceived(TransportShardSingleOperationAction.java:280)
    at org.elasticsearch.transport.netty.MessageChannelHandler$RequestHandler.doRun(MessageChannelHandler.java:279)
    at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:36)

please guide me how to fetch these values

Answer 1

Yeah Actually the problem is that you have mentioned both "ArtShare" and "ArtShare.TotalArtShares" in the fields array. So it throws exception as you have already retrieved complete ArtShare object.

So please mention the fields that you want, If you want specified nested values then no need to access complete parent object.

Try this:

val get=client.prepareGet("Testdb","artWork",Id.toString())
        .setOperationThreaded(false)
        .setFields("uuid","StatusHistoryList",
            "ArtShare.TotalArtShares")
        .execute()
        .actionGet()
        if(get.isExists())
        {
        uuid=get.getField("uuid").getValue.toString().toInt
       var totalShares= get.getField("ArtShare.TotalArtShares" 
     }

And if you want complete "ArtShare" object then simply write :

val get=client.prepareGet("Testdb","artWork",Id.toString())
    .setOperationThreaded(false)
    .setFields("uuid","ArtShare","StatusHistoryList"
        )
    .execute()
    .actionGet()
    if(get.isExists())
    {
    uuid=get.getField("uuid").getValue.toString().toInt
   //how to fetch `artShare` whole nested document and array elements `StatusHistoryListof`  
 }