We currently have a suspicion that moving an empty chunk would skip through all of our majority commit checkpoints, and thus will be already-optimized in movement speed. Create a test that:

1. Creates a collection and shards it.
2. Splits the collection into ~100 chunks.
3. Move half of the chunks into another shard.

In doing so, you would time how long it takes to move these chunks en masse.

You will also do investigation on the time difference between moving a chunk with one document and a chunk with zero documents. Note that to do this, you must already have one chunk on each shard, so as to avoid the initial overhead it takes to create a new collection on a recipient shard.