Fetching only selective fields using ElasticSearch RestHighLevelClient

Question

I am using RestHighLevelClient to fetch documents from ES storage.

.....
RestHighLevelClient client = new RestHighLevelClient(restClientBuilder);
final Scroll scroll = new Scroll(TimeValue.timeValueMinutes(60L));
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.size(100);
sourceBuilder.query(QueryBuilders.matchQuery("id", id));
SearchRequest searchRequest = new SearchRequest("my-index");
searchRequest.scroll(scroll);
searchRequest.source(sourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

Currently this fetches all fields, but I want to fetch only a specific field.

How can this be done using RestHighLevelClient.

Amit · Accepted Answer · 2021-02-24 16:43:40Z

1

You need to use the source filtering and pass the array of field names that you want to fetch, below request added on according to your example will fetch only title fields and exclude everything else in response.

RestHighLevelClient client = new RestHighLevelClient(restClientBuilder);
final Scroll scroll = new Scroll(TimeValue.timeValueMinutes(60L));
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.size(100);
String[] includeFields = new String[] {"title"};
sourceBuilder.fetchSource(includeFields, null);
sourceBuilder.query(QueryBuilders.matchQuery("id", id));
SearchRequest searchRequest = new SearchRequest("my-index");
searchRequest.scroll(scroll);
searchRequest.source(sourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

answered Feb 24, 2021 at 16:43

Amit

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