Duplicate keys, schema validation and updates to immutable fields.
11000
E11000 duplicate key errorA write would store a key that already exists in a unique index (_id or another unique field).
121
Document failed validationAn insert or update breaks the collection validator ($jsonSchema); errInfo names the failing rule.
66
Performing an update on the path '_id' would modify the immutable field '_id'An update or replacement tries to change _id, which is immutable.
No errors in this category match your search. Search the whole library.