Get only ids with no source Java API

Elastic Stack Elasticsearch
1

Is there a way in elasticsearch using JAVA API to get only the ids of the
documents returned for a give query.

SearchResponse sr =

esClient.prepareSearch(index).setSize(resultSize).setQuery(q).setScroll(new
TimeValue(10000)).setQuery(fqb).setFetchSource(false).get();

but I get empty hits (sr.getHits().hits[].length == 0) althouh the total
count of returned hits is 0 (sr.getHits().getTotalHits == 2). I
understand that nothing is returned by elasticsearch because I set fetch
source to false, but the ids should somehow be available. My current
solution is:

SearchResponse sr =

esClient.prepareSearch(index).setSize(resultSize).setQuery(q).setScroll(new
TimeValue(10000)).setQuery(fqb).srb.setFetchSource("_id", null).get();

However I think that gets the _id field from source, and for speed I would
like to avoid this if possible.

Thanks,
Ilija

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2

Have you tried setting no fields to be returned or the explicit
setNoFields() method?

http://jenkins.elasticsearch.org/job/Elasticsearch%20Master%20Branch%20Javadoc/Elasticsearch_API_Documentation/org/elasticsearch/action/search/SearchRequestBuilder.html#setNoFields()

--
Ivan

On Thu, Oct 16, 2014 at 2:45 AM, Ilija Subasic subasic.ilija@gmail.com
wrote:

Is there a way in elasticsearch using JAVA API to get only the ids of the
documents returned for a give query.

SearchResponse sr =

esClient.prepareSearch(index).setSize(resultSize).setQuery(q).setScroll(new
TimeValue(10000)).setQuery(fqb).setFetchSource(false).get();

but I get empty hits (sr.getHits().hits[].length == 0) althouh the total
count of returned hits is 0 (sr.getHits().getTotalHits == 2). I
understand that nothing is returned by elasticsearch because I set fetch
source to false, but the ids should somehow be available. My current
solution is:

SearchResponse sr =

esClient.prepareSearch(index).setSize(resultSize).setQuery(q).setScroll(new
TimeValue(10000)).setQuery(fqb).srb.setFetchSource("_id", null).get();

However I think that gets the _id field from source, and for speed I would
like to avoid this if possible.

Thanks,
Ilija

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