def test_partial_update_should_handle_missing_id(self):
        """Test handling of document without _id field
        
        This test verifies that partial updates can correctly handle documents
        without an _id field.
        """
        res = self.config.document.partial_update_documents([{
            'int_field': 100
        }], self.index)
        self.assertTrue(res.errors)
        self.assertIn("'_id' is a required field", res.items[0].error.lower())
        self.assertEqual(400, res.items[0].status)
Test handling of document without _id field
        
        This test verifies that partial updates can correctly handle documents
        without an _id field.
        
tests/integ_tests/core/document/test_partial_update_semi_structured.py