add test and changelog for search with retrieve specific fields

CHANGELOG.md

@@ -5,9 +5,10 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ## [Unreleased]
 
 ### Added
-- Adds GlobalIOUsage struct for nodes stats ([#506]((https://github.com/opensearch-project/opensearch-go/pull/506))
+- Adds GlobalIOUsage struct for nodes stats ([#506]((https://github.com/opensearch-project/opensearch-go/pull/506)))
 
-- Adds the `Explanation` field containing the document explain details to the `SearchHit` struct. ([#504](https://github.com/opensearch-project/opensearch-go/pull/504)
+- Adds the `Explanation` field containing the document explain details to the `SearchHit` struct. ([#504](https://github.com/opensearch-project/opensearch-go/pull/504))
+- Adds the `Fields` field containing the document fields to the `SearchHit` struct. ([#508](https://github.com/opensearch-project/opensearch-go/pull/508))
 ### Changed
 - Use docker compose v2 instead of v1 ([#506]((https://github.com/opensearch-project/opensearch-go/pull/506))
 

opensearchapi/api_search_test.go

@@ -71,4 +71,21 @@ func TestSearch(t *testing.T) {
 		assert.NotEmpty(t, resp.Hits.Hits)
 		assert.NotNil(t, resp.Hits.Hits[0].Explanation)
 	})
+
+	t.Run("request with retrieve specific fields", func(t *testing.T) {
+		resp, err := client.Search(nil, &opensearchapi.SearchReq{Indices: []string{index}, Body: strings.NewReader(`{
+		  "query": {
+			"match": {
+			  "foo": "bar"
+			}
+		  },
+		  "fields": [
+			"foo"
+		  ],
+		  "_source": false
+		}`)})
+		require.Nil(t, err)
+		assert.NotEmpty(t, resp.Hits.Hits)
+		assert.NotEmpty(t, resp.Hits.Hits[0].Fields)
+	})
 }