java - Return a specific field from elasticsearch index or update query -


here part of code index or update document. want specific field value 'documentid' in '_source'.here 'json' jsonobject of document model.

 string jsonforupdate = json.tostring();     string uuid = uuid.randomuuid().tostring();     json.put("documentid", uuid);     string jsonforindex = json.tostring();        indexrequest indexrequest = new indexrequest(indexname, typename, documentmodel.getid());     indexrequest.source(jsonforindex);     updateresponse updateresponse = elasticsearchtemplate.getclient().prepareupdate(indexname, typename , documentmodel.getid()).setdoc(jsonforupdate).setupsert(indexrequest).setfields("documentid").get();

i tried code value document field.

updateresponse.getgetresult().getfields().get("documentid").getvalue().tostring();

but didnt work me during updating document.works fine during indexing document.

if at: https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-update.html

you can see following parameter can passed on update:

_source  allows control if , how updated source should returned in response. default updated source not returned. see source filtering details.

this mean in prepareupdate can use setfetchsource(true) method, although bring full document.

update: version 2.3.3 can still use:

/**  * explicitly specify fields returned. default, nothing returned.  */ public updaterequestbuilder setfields(string... fields) {     request.fields(fields);     return this; }

elasticsearch doc: https://www.elastic.co/guide/en/elasticsearch/reference/2.3/docs-update.html

the method available on updaterequestbuilder, class of object returned prepareupdate.


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