diff --git a/internal/core/src/common/Schema.cpp b/internal/core/src/common/Schema.cpp
index a6e7c892ef220c0bd2dc0fa6a8eec6cd30499ac2..d5da651db1708c7aa2798be7811a040a625596f3 100644
--- a/internal/core/src/common/Schema.cpp
+++ b/internal/core/src/common/Schema.cpp
@@ -11,8 +11,10 @@
 
 #include "common/Schema.h"
 #include <google/protobuf/text_format.h>
+#include <boost/algorithm/string/case_conv.hpp>
 #include <boost/lexical_cast.hpp>
 #include "common/SystemProperty.h"
+#include <optional>
 
 namespace milvus {
 
@@ -57,17 +59,15 @@ Schema::ParseFrom(const milvus::proto::schema::CollectionSchema& schema_proto) {
         if (datatype_is_vector(data_type)) {
             auto type_map = RepeatedKeyValToMap(child.type_params());
             auto index_map = RepeatedKeyValToMap(child.index_params());
-            if (!index_map.count("metric_type")) {
-                auto default_metric_type =
-                    data_type == DataType::VECTOR_FLOAT ? MetricType::METRIC_L2 : MetricType::METRIC_Jaccard;
-                index_map["metric_type"] = MetricTypeToName(default_metric_type);
-            }
 
             AssertInfo(type_map.count("dim"), "dim not found");
             auto dim = boost::lexical_cast<int64_t>(type_map.at("dim"));
-            AssertInfo(index_map.count("metric_type"), "index not found");
-            auto metric_type = GetMetricType(index_map.at("metric_type"));
-            schema->AddField(name, field_id, data_type, dim, metric_type);
+            if (!index_map.count("metric_type")) {
+                schema->AddField(name, field_id, data_type, dim, std::nullopt);
+            } else {
+                auto metric_type = GetMetricType(index_map.at("metric_type"));
+                schema->AddField(name, field_id, data_type, dim, metric_type);
+            }
         } else {
             schema->AddField(name, field_id, data_type);
         }
diff --git a/internal/core/src/common/Schema.h b/internal/core/src/common/Schema.h
index cadf62e8cb73750a34459b3407b0a486e4f14e7e..8975b201bb873fd8f39ac3b2f50c0e2e2fa0b774 100644
--- a/internal/core/src/common/Schema.h
+++ b/internal/core/src/common/Schema.h
@@ -52,7 +52,11 @@ class Schema {
 
     // vector type
     void
-    AddField(const FieldName& name, const FieldId id, DataType data_type, int64_t dim, MetricType metric_type) {
+    AddField(const FieldName& name,
+             const FieldId id,
+             DataType data_type,
+             int64_t dim,
+             std::optional<MetricType> metric_type) {
         auto field_meta = FieldMeta(name, id, data_type, dim, metric_type);
         this->AddField(std::move(field_meta));
     }
diff --git a/internal/core/src/common/Types.cpp b/internal/core/src/common/Types.cpp
index 1e1c2f58a0fd353038d20aa250bb00e1de385e0f..4b97237c8d59828ec32a3614f5867f1500505dca 100644
--- a/internal/core/src/common/Types.cpp
+++ b/internal/core/src/common/Types.cpp
@@ -9,9 +9,6 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 // or implied. See the License for the specific language governing permissions and limitations under the License
 
-//
-// Created by mike on 12/3/20.
-//
 #include "common/Types.h"
 #include <knowhere/index/vector_index/helpers/IndexParameter.h>
 #include "exceptions/EasyAssert.h"