Settings for index.merge.policy.* move?

Hi, I move to ES 5.4 from ES 1.7 recently and it seems to me that some configuration was changed. Like index.merge.policy.*

I used to set this in elasticsearch.yml but in 5.4 has been moved as index settings.

#1. Does this mean that I can set different merge policy params for the different index?
#2. What is the purpose to move these settings?

Thanks in advance.

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