diff --git a/internal/distributed/proxy/httpserver/handler_v2.go b/internal/distributed/proxy/httpserver/handler_v2.go
index fced1d4877ed1..4548e334d9bfc 100644
--- a/internal/distributed/proxy/httpserver/handler_v2.go
+++ b/internal/distributed/proxy/httpserver/handler_v2.go
@@ -1863,8 +1863,16 @@ func (h *HandlersV2) createIndex(ctx context.Context, c *gin.Context, anyReq any
 		}
 		c.Set(ContextRequest, req)
 
-		for key, value := range indexParam.Params {
-			req.ExtraParams = append(req.ExtraParams, &commonpb.KeyValuePair{Key: key, Value: fmt.Sprintf("%v", value)})
+		var err error
+		req.ExtraParams, err = convertToExtraParams(indexParam)
+		if err != nil {
+			// will not happen
+			log.Ctx(ctx).Warn("high level restful api, convertToExtraParams fail", zap.Error(err), zap.Any("request", anyReq))
+			HTTPAbortReturn(c, http.StatusOK, gin.H{
+				HTTPReturnCode:    merr.Code(err),
+				HTTPReturnMessage: err.Error(),
+			})
+			return nil, err
 		}
 		resp, err := wrapperProxyWithLimit(ctx, c, req, h.checkAuth, false, "/milvus.proto.milvus.MilvusService/CreateIndex", true, h.proxy, func(reqCtx context.Context, req any) (interface{}, error) {
 			return h.proxy.CreateIndex(reqCtx, req.(*milvuspb.CreateIndexRequest))
diff --git a/internal/distributed/proxy/httpserver/handler_v2_test.go b/internal/distributed/proxy/httpserver/handler_v2_test.go
index 8f317c9739f3d..d8047bde8b323 100644
--- a/internal/distributed/proxy/httpserver/handler_v2_test.go
+++ b/internal/distributed/proxy/httpserver/handler_v2_test.go
@@ -709,6 +709,46 @@ func TestDocInDocOutSearch(t *testing.T) {
 	sendReqAndVerify(t, testEngine, testcase.path, http.MethodPost, testcase)
 }
 
+func TestCreateIndex(t *testing.T) {
+	paramtable.Init()
+	// disable rate limit
+	paramtable.Get().Save(paramtable.Get().QuotaConfig.QuotaAndLimitsEnabled.Key, "false")
+	defer paramtable.Get().Reset(paramtable.Get().QuotaConfig.QuotaAndLimitsEnabled.Key)
+
+	postTestCases := []requestBodyTestCase{}
+	mp := mocks.NewMockProxy(t)
+	mp.EXPECT().CreateIndex(mock.Anything, mock.Anything).Return(commonSuccessStatus, nil).Twice()
+	testEngine := initHTTPServerV2(mp, false)
+	path := versionalV2(IndexCategory, CreateAction)
+	// the previous format
+	postTestCases = append(postTestCases, requestBodyTestCase{
+		path:        path,
+		requestBody: []byte(`{"collectionName": "` + DefaultCollectionName + `", "indexParams": [{"fieldName": "book_intro", "indexName": "book_intro_vector", "metricType": "L2", "params": {"index_type": "L2", "nlist": 10}}]}`),
+	})
+	// the current format
+	postTestCases = append(postTestCases, requestBodyTestCase{
+		path:        path,
+		requestBody: []byte(`{"collectionName": "` + DefaultCollectionName + `", "indexParams": [{"fieldName": "book_intro", "indexName": "book_intro_vector", "metricType": "L2", "indexType": "L2", "params":{"nlist": 10}}]}`),
+	})
+
+	for _, testcase := range postTestCases {
+		t.Run("post"+testcase.path, func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodPost, testcase.path, bytes.NewReader(testcase.requestBody))
+			w := httptest.NewRecorder()
+			testEngine.ServeHTTP(w, req)
+			assert.Equal(t, http.StatusOK, w.Code)
+			fmt.Println(w.Body.String())
+			returnBody := &ReturnErrMsg{}
+			err := json.Unmarshal(w.Body.Bytes(), returnBody)
+			assert.Nil(t, err)
+			assert.Equal(t, testcase.errCode, returnBody.Code)
+			if testcase.errCode != 0 {
+				assert.Equal(t, testcase.errMsg, returnBody.Message)
+			}
+		})
+	}
+}
+
 func TestCreateCollection(t *testing.T) {
 	paramtable.Init()
 	// disable rate limit
diff --git a/internal/distributed/proxy/httpserver/utils.go b/internal/distributed/proxy/httpserver/utils.go
index 084a579925e5f..eda05468a84e2 100644
--- a/internal/distributed/proxy/httpserver/utils.go
+++ b/internal/distributed/proxy/httpserver/utils.go
@@ -1489,6 +1489,14 @@ func convertToExtraParams(indexParam IndexParam) ([]*commonpb.KeyValuePair, erro
 	if indexParam.IndexType != "" {
 		params = append(params, &commonpb.KeyValuePair{Key: common.IndexTypeKey, Value: indexParam.IndexType})
 	}
+	if indexParam.IndexType == "" {
+		for key, value := range indexParam.Params {
+			if key == common.IndexTypeKey {
+				params = append(params, &commonpb.KeyValuePair{Key: common.IndexTypeKey, Value: fmt.Sprintf("%v", value)})
+				break
+			}
+		}
+	}
 	if indexParam.MetricType != "" {
 		params = append(params, &commonpb.KeyValuePair{Key: common.MetricTypeKey, Value: indexParam.MetricType})
 	}
diff --git a/tests/restful_client_v2/testcases/test_index_operation.py b/tests/restful_client_v2/testcases/test_index_operation.py
index 534684c9bfbdf..a528aec87a18a 100644
--- a/tests/restful_client_v2/testcases/test_index_operation.py
+++ b/tests/restful_client_v2/testcases/test_index_operation.py
@@ -72,8 +72,10 @@ def test_index_e2e(self, dim, metric_type, index_type):
                              "metricType": f"{metric_type}"}]
         }
         if index_type == "HNSW":
+            payload["indexParams"][0]["indexType"]="HNSW"
             payload["indexParams"][0]["params"] = {"index_type": "HNSW", "M": "16", "efConstruction": "200"}
         if index_type == "AUTOINDEX":
+            payload["indexParams"][0]["indexType"]="AUTOINDEX"
             payload["indexParams"][0]["params"] = {"index_type": "AUTOINDEX"}
         rsp = self.index_client.index_create(payload)
         assert rsp['code'] == 0
@@ -89,8 +91,8 @@ def test_index_e2e(self, dim, metric_type, index_type):
         for i in range(len(expected_index)):
             assert expected_index[i]['fieldName'] == actual_index[i]['fieldName']
             assert expected_index[i]['indexName'] == actual_index[i]['indexName']
+            assert expected_index[i]['indexType'] == actual_index[i]['indexType']
             assert expected_index[i]['metricType'] == actual_index[i]['metricType']
-            assert expected_index[i]["params"]['index_type'] == actual_index[i]['indexType']
 
         # drop index
         for i in range(len(actual_index)):
@@ -152,7 +154,7 @@ def test_index_for_scalar_field(self, dim, index_type):
         # create index
         payload = {
             "collectionName": name,
-            "indexParams": [{"fieldName": "word_count", "indexName": "word_count_vector",
+            "indexParams": [{"fieldName": "word_count", "indexName": "word_count_vector","indexType": "INVERTED",
                              "params": {"index_type": "INVERTED"}}]
         }
         rsp = self.index_client.index_create(payload)
@@ -169,7 +171,7 @@ def test_index_for_scalar_field(self, dim, index_type):
         for i in range(len(expected_index)):
             assert expected_index[i]['fieldName'] == actual_index[i]['fieldName']
             assert expected_index[i]['indexName'] == actual_index[i]['indexName']
-            assert expected_index[i]['params']['index_type'] == actual_index[i]['indexType']
+            assert expected_index[i]['indexType'] == actual_index[i]['indexType']
 
     @pytest.mark.parametrize("index_type", ["BIN_FLAT", "BIN_IVF_FLAT"])
     @pytest.mark.parametrize("metric_type", ["JACCARD", "HAMMING"])
@@ -220,7 +222,7 @@ def test_index_for_binary_vector_field(self, dim, metric_type, index_type):
         index_name = "binary_vector_index"
         payload = {
             "collectionName": name,
-            "indexParams": [{"fieldName": "binary_vector", "indexName": index_name, "metricType": metric_type,
+            "indexParams": [{"fieldName": "binary_vector", "indexName": index_name, "metricType": metric_type,"indexType": index_type,
                              "params": {"index_type": index_type}}]
         }
         if index_type == "BIN_IVF_FLAT":
@@ -239,7 +241,7 @@ def test_index_for_binary_vector_field(self, dim, metric_type, index_type):
         for i in range(len(expected_index)):
             assert expected_index[i]['fieldName'] == actual_index[i]['fieldName']
             assert expected_index[i]['indexName'] == actual_index[i]['indexName']
-            assert expected_index[i]['params']['index_type'] == actual_index[i]['indexType']
+            assert expected_index[i]['indexType'] == actual_index[i]['indexType']
 
 
 @pytest.mark.L1