Search in elasticsearch 8

avnere · May 24, 2022, 11:24am

Hi,

In v.7.X the search performed as follow:

searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

How do I perform search in v.8 without defining the target class for the matching documents. (I want to keep it as json without searlization, without specifying Product class)

searchResponse = client.search(searchRequest, Product.class);

dadoonet · May 24, 2022, 11:52am

I think you can use Void.class.
And do something like this to get the JSON Response:

github.com

dadoonet/legacy-search/blob/02-search/src/main/java/fr/pilato/demo/legacysearch/dao/ElasticsearchDao.java#L125-L131

      
        
            private String jsonToString(JsonpSerializable json) {
                StringWriter writer = new StringWriter();
                JsonGenerator generator = jacksonJsonpMapper.jsonProvider().createGenerator(writer);
                json.serialize(generator, jacksonJsonpMapper);
                generator.close();
                return writer.toString();
            }

avnere · May 24, 2022, 12:07pm

I tried:

searchResponse = client.search(searchRequest, Void.class);

Failed with:

The method search(SearchRequest, Class<TDocument>) in the type ElasticsearchClient is not applicable for the arguments (SearchRequest, Class<Void>)

dadoonet · May 24, 2022, 1:39pm

@swallez Do you know?

avnere · May 25, 2022, 3:21pm

Can you help with it?

vincenbr · May 25, 2022, 4:06pm

I'm not sure why Void.class does not work here, but for your purpose I would try to have the response read as raw json, using for instance ObjectNode.class as in
https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/reading.html#_reading_raw_json

system · June 22, 2022, 4:06pm

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