MongoBulkWriteError: E11000 duplicate key error collection: ..._alclient.entities index: serverRegion_1_serverIdentifier_1_name_1_type_1 dup key: { serverRegion: "US", serverIdentifier: "III", name: null, type: "mrpumpkin" }
This happens to mrpumpkin & mrgreen, in both cases the key part name is null.
So it's obviously this index that raises the issue:
EntitySchema.index({ name: 1, serverIdentifier: 1, serverRegion: 1, type: 1 }, { unique: true })