Making the following server parameters configurable at both startup and runtime would increase the flexibility for end-users.
- reshardingCollectionClonerBatchSizeInBytes
- reshardingTxnClonerProgressBatchSize
- reshardingOplogBatchTaskCount
- reshardingBatchLimitOperations (also rename Batch -> OplogBatch)
- reshardingBatchLimitBytes (also rename Batch -> OplogBatch)