Retrieving specific fields using the Elasticsearch Java API

Question

I am using the Java API for Elasticsearch. Having saved entities into indexes, it is possible to retrieve them together with the complete source. However, I only want to ret

Answer 1

You can specify the fields you need using the setFetchSource(String[] includes, String[] excludes) method. Try this instead

SearchResponse response = client.prepareSearch("my-index")
   .setTypes("my-type")
   .setSearchType(SearchType.QUERY_AND_FETCH)
   .setFetchSource(new String[]{"field1"}, null)
   .setQuery(QueryBuilders.termsQuery("field1", "1234"))
   .execute()
   .actionGet();

for (SearchHit hit : response.getHits()){
   Map map = hit.getSource();
   map.toString();
}

map will only contain the fields you've specified.

Note that .setFetchSource("field1", null) (if you need a single field) or .setFetchSource("field*", null) (if you need several wildcarded fields) would work, too.