Unable to set index.merge.scheduler.max_thread_count

According to official document said, if we unfortunately still use spin disk, we should set this value to 1.
I used to be set this in elasticsearch.yml but not luck in v5.4

I know this setting has been move to index level, what I confused is, if this is per index setting? What happened if I create two indices and set this value to different in each indices?

Can anyone help to guide?

Then they will have different merge settings.

So merge scheduler is per shard? since each shard is actually a Lucene writer?
If a node with 2 indices, index A set max_thread_count=1, index B set max_thread_count=2. We will have 3 threads running when doing merge right?
I thought this is node setting.

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