Elasticsearch return raw json with java api

Question

I have following requirements in my spring web app:

find objects from Elasticsearch and display them on google map (json format preferred)
find objects (the same query as above) from Elasticsearch and display them on list (java objects format preferred to display it on JSP page)

I've written search with Java API using SearchRequestBuilder and it works fine:

SearchRequestBuilder request = client.prepareSearch("index").setTypes("type")
        .setSearchType(SearchType.QUERY_THEN_FETCH).setFrom(0).setSize(10).addFields(RESPONSE_FIELDS);
//request is much more complicated
//...
SearchResponse response = request.execute().actionGet();
SearchHits hits = response.getHits();

But for displaying it on google map i would prefer to just get JSON object from elasticsearch instead of SearchResponse object like this:

{
    "_index": "indexName",
    "_type": "type",
    "_id": "9094",
    "_version": 31,
    "found": true,
    "_source": {
        //list of properties
    }
}

Is it possible to get JSON response using Java API + SearchRequestBuilder or i have to use REST API for that?

hubbardr · Accepted Answer · 2015-07-11 18:27:18Z

3

The Java api will not map to json (or any other entity for that matter) for you. However, you could do something like:

use spring-data-elasticsearch to deserialize directly to an entity
take the response from the Java api and parse to json using something like Jackson
consider using the jest Api which will return a gson (Googles json).

answered Jul 11, 2015 at 18:27

hubbardr

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1 Comment

Stellar Sword Over a year ago

You can use jayway path to parse the SearchHit.getSource (which also integrates with Mappers like Jackson & SmartJSON to map back to a class/object, and vice-versa). I feel it's important to keep types agnostic for NoSQL databases like Elastic. Don't try too hard to make "many types".

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