Sh.status.shards.state from sh.status()

I was studying about sh.status().
And I tested sh.status.shards.state.

If I shutdown all the #1 Shard Servers, I expected sh.status.shards.state to be 0, but I found that it remained 1 over time.

What does aware mean in sh.status.shards.state?

sh.status() — MongoDB Manual
sh.status.shards. state
The state displays:

  • 0 if the shard is not shard aware.
  • 1 if the shard is shard aware.