Although steady state oplog application puts applyOps command with prepare: true in its own batch in
SERVER-35307. The batcher of OplogApplier used by initial sync and replication recovery doesn't do that. SERVER-35880 will revert this and parallelizes oplog application of transaction operations. For initial sync and replication recovery, it's natural to parallelize transaction operations since we don't apply ops until we see the 'commitTransaction' oplog entry.