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The "reshardDest" field should be added to the DurableReplOperation struct.

{
    op: 'i' | 'u' | 'd',
    ns: "<database>.<collection>", ui: <existingUUID>,
    reshardDest: "<recipientShardId>",
    o: { ... }, ...
}

And the destined recipient should be added as a parameter to OplogEntry::OplogEntry() and makeOplogEntryDoc(). Consider using boost::optional<ShardId> here and the shard_id type in oplog_entry.idl.

has to be done before

SERVER-49822 Add destined recipient to oplog entries from inserts

SERVER-49823 Add destined recipient to oplog entries from updates

SERVER-49824 Add destined recipient to oplog entries from deletes