Fix: missing parent chunk issue. (#12789)

### What problem does this PR solve?

Close #12783

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/db/services/document_service.py

@@ -786,6 +786,8 @@ class DocumentService(CommonService):
                 return "string"
             if isinstance(value, (int, float)):
                 return "number"
+            if re.match(r"\d{4}\-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}", str(value)):
+                return "time"
             return "string"
 
         fields = [cls.model.id, cls.model.meta_fields]