I caught a mistake

Failed process for one reason: timeout, killed, SIGTERM ↵2020-01-28T13:24:28.601+0200 connected to: mongodb://localhost:27017/↵2020-01-28T13:24:28.738+0200 Failed: bulk write error: [{[

{After applying the update, the (immutable) field '_id' was found to have been altered to _id: ObjectId('_REDACTED__')}

]}, {<nil>}]↵2020-01-28T13:24:28.738+0200 0 document(s) imported successfully. 1 document(s) failed to import.

 

What is remarkable:
If items are less then 10 - import is correct