Added DefaultMapper support to map only partial fields from result instead of whole source field.

src/test/java/org/springframework/data/elasticsearch/core/DefaultResultMapperTests.java

@@ -3,14 +3,22 @@ package org.springframework.data.elasticsearch.core;
 import org.apache.commons.collections.iterators.ArrayIterator;
 import org.elasticsearch.action.get.GetResponse;
 import org.elasticsearch.action.search.SearchResponse;
+import org.elasticsearch.index.get.GetField;
 import org.elasticsearch.search.SearchHit;
+import org.elasticsearch.search.SearchHitField;
 import org.elasticsearch.search.SearchHits;
+import org.elasticsearch.search.internal.InternalSearchHitField;
 import org.junit.Before;
 import org.junit.Test;
 import org.mockito.Mock;
+import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
 import org.springframework.data.elasticsearch.Car;
 
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.junit.Assert.assertThat;
@@ -51,6 +59,24 @@ public class DefaultResultMapperTests {
         assertThat(page.getContent().get(0).getName(), is("Ford"));
     }
 
+    @Test
+    public void shouldMapPartialSearchRequestToObject() {
+        //Given
+        SearchHit[] hits = {createCarPartialHit("Ford", "Grat"), createCarPartialHit("BMW", "Arrow")};
+        SearchHits searchHits = mock(SearchHits.class);
+        when(searchHits.totalHits()).thenReturn(2L);
+        when(searchHits.iterator()).thenReturn(new ArrayIterator(hits));
+        when(response.getHits()).thenReturn(searchHits);
+
+        //When
+        FacetedPage<Car> page = resultMapper.mapResults(response, Car.class, null);
+
+        //Then
+        assertThat(page.hasContent(), is(true));
+        assertThat(page.getTotalElements(), is(2L));
+        assertThat(page.getContent().get(0).getName(), is("Ford"));
+    }
+
     @Test
     public void shouldMapGetRequestToObject() {
         //Given
@@ -72,6 +98,13 @@ public class DefaultResultMapperTests {
         return hit;
     }
 
+    private SearchHit createCarPartialHit(String name, String model) {
+        SearchHit hit = mock(SearchHit.class);
+        when(hit.sourceAsString()).thenReturn(null);
+        when(hit.getFields()).thenReturn(createCarFields(name, model));
+        return hit;
+    }
+
     private String createJsonCar(String name, String model) {
         final String q = "\"";
         StringBuffer sb = new StringBuffer();
@@ -80,4 +113,11 @@ public class DefaultResultMapperTests {
         return sb.toString();
     }
 
+    private Map<String, SearchHitField> createCarFields(String name, String model) {
+        Map<String, SearchHitField> result = new HashMap<String, SearchHitField>();
+        result.put("name", new InternalSearchHitField("name", Arrays.<Object>asList(name)));
+        result.put("model", new InternalSearchHitField("model", Arrays.<Object>asList(model)));
+        return result;
+    }
+
 }