Do not send empty lists to the DLQ when all items share the same retryable failure #3660
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Description
This adds a check for an empty list of failed documents. This could happen when a bulk request fails with all documents having the failure. For example, when there is no permission to write to a certain index, but there are permissions to write to a domain, all of the documents in that index will fail.
Issues Resolved
Resolves #3644
Check List
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