Elasticsearch Java API do not return fields of hits

Question

I have a problem with the java api for elasticsearch.

When I do a search like this:

MatchQueryBuilder query = QueryBuilders.matchQuery("_type", "booking");

SearchResponse searchResponse = client.prepareSearch().setQuery(query).execute().actionGet();

for (SearchHit hit : searchResponse.getHits()){
    Map<String, SearchHitField> fields = hit.getFields();
    System.out.println(fields.size());
}

my response never has fields, can somebody help me ?

I'am using:

elasticsearch java api 1.4.0 elasticsearch 1.4.0

and my data looks like

{
  "_index": "bookings",
  "_type": "booking",
  "_id": "50245171",
  "_score": 1,
  "_source": {
    "field1": "value1",
    "field2": "value2",
    "field3": "value3",
    ...
  }
}

Answer 1

Have you tried adding .addFields() to your query?

SearchResponse searchResponse = client.prepareSearch().setQuery(query).addFields("field1", "field2",...).execute().actionGet();

I'm not sure about all details, but I believe elasticsearch tries to send you as few data as possible. Which makes sense, since it should be fast and light.

In any case, are you by any chance indexing Booking objects? Because if you need the whole object again, you could also just fetch the source and transform that back into its original Booking object. For example:

ObjectMapper mapper = new ObjectMapper();
Booking booking = mapper.readValue(hit.getSourceAsString(), Booking.class);

ObjectMapper is from com.fasterxml.jackson.databind.ObjectMapper (should be included with elasticsearch I believe).

Answer 2

the fields are not responding as fields....

with hit.getSource() i got my information