Return error response instead of panicking for unimplemented APIs (#26589)

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

internal/distributed/proxy/service.go

@@ -1099,11 +1099,21 @@ func (s *Server) ListResourceGroups(ctx context.Context, req *milvuspb.ListResou
 }
 
 func (s *Server) ListIndexedSegment(ctx context.Context, req *federpb.ListIndexedSegmentRequest) (*federpb.ListIndexedSegmentResponse, error) {
-	panic("TODO: implement me")
+	return &federpb.ListIndexedSegmentResponse{
+		Status: &commonpb.Status{
+			ErrorCode: commonpb.ErrorCode_UnexpectedError,
+			Reason:    "not implemented",
+		},
+	}, nil
 }
 
 func (s *Server) DescribeSegmentIndexData(ctx context.Context, req *federpb.DescribeSegmentIndexDataRequest) (*federpb.DescribeSegmentIndexDataResponse, error) {
-	panic("TODO: implement me")
+	return &federpb.DescribeSegmentIndexDataResponse{
+		Status: &commonpb.Status{
+			ErrorCode: commonpb.ErrorCode_UnexpectedError,
+			Reason:    "not implemented",
+		},
+	}, nil
 }
 
 func (s *Server) Connect(ctx context.Context, req *milvuspb.ConnectRequest) (*milvuspb.ConnectResponse, error) {

internal/distributed/proxy/service_test.go

@@ -42,6 +42,7 @@ import (
 	"google.golang.org/grpc/health/grpc_health_v1"
 
 	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
+	"github.com/milvus-io/milvus-proto/go-api/v2/federpb"
 	"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
 	"github.com/milvus-io/milvus/internal/mocks"
 	"github.com/milvus-io/milvus/internal/proto/datapb"
@@ -1717,3 +1718,25 @@ func Test_NewServer_GetVersion(t *testing.T) {
 		assert.NoError(t, err)
 	})
 }
+
+func TestNotImplementedAPIs(t *testing.T) {
+	server := getServer(t)
+
+	t.Run("ListIndexedSegment", func(t *testing.T) {
+		assert.NotPanics(t, func() {
+			resp, err := server.ListIndexedSegment(context.TODO(), &federpb.ListIndexedSegmentRequest{})
+			assert.NoError(t, err)
+			assert.NotNil(t, resp)
+			assert.Equal(t, commonpb.ErrorCode_UnexpectedError, resp.GetStatus().GetErrorCode())
+		})
+	})
+
+	t.Run("DescribeSegmentIndexData", func(t *testing.T) {
+		assert.NotPanics(t, func() {
+			resp, err := server.DescribeSegmentIndexData(context.TODO(), &federpb.DescribeSegmentIndexDataRequest{})
+			assert.NoError(t, err)
+			assert.NotNil(t, resp)
+			assert.Equal(t, commonpb.ErrorCode_UnexpectedError, resp.GetStatus().GetErrorCode())
+		})
+	})
+}