Currently, the recipient synchronously fetches _xferMods from the donor and then applies them. We can achieve much higher throughput if we make the application overlapped with fetching, similar to the clone path. That way the donor can be sending the mods concurrently with the recipient applying them.
- has to be done after
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SERVER-58211 Deduplicate entries returned in a single invocation to `MigrationChunkClonerSourceLegacy::nextModsBatch`
- Closed
- has to be done before
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SERVER-58217 Apply the updates from `_xferMods` in parallel on the recipient
- Closed
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SERVER-58218 Apply the deletes from `_xferMods` in parallel on the recipient
- Closed