Efficient way to get only _ids in ElasticSearch - Java

Question

Is this the most efficient way to retrieve only ids from ElasticSearch?

requestBuilder.setQuery(queryBuilder);
    requestBuilder.setFrom(start);
    requestBuilder.setSize(limit);
    requestBuilder.setFetchSource(false);

    SearchResponse response = requestBuilder.execute().actionGet();

    SearchHit[] hits = response.getHits().getHits();
    List<Long> refugeeIds = new ArrayList<>();
    for (SearchHit hit : hits) {
        if (hit.getId() != null) {
            refugeeIds.add(Long.parseLong(hit.getId().toString()));
        }
    }

Andrei Stefan · Accepted Answer · 2016-08-02 20:09:07Z

1

That should be the best way. You don't return the _source and ES will only return the _type, _index, _score and _id.

answered Aug 2, 2016 at 20:09

Andrei Stefan

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