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Bulk delete is not supported on a Cosmos DB target for non-partitioned collections and non-string partition keys in a partitioned collection.
Microsoft ticket reference number: 119062023000328
When you perform an insert operation on a Cosmos DB target in bulk mode and the source data documents are corrupted or violate a constraint, the Secure Agent does not skip the corrupted documents and the task fails abruptly.
Microsoft ticket reference number: 119061723001555