A Question about Indices recovery type

Hi there
I checked indices recovery types of Elasticsearch
In the document, the type of indices recovery is store, snapshot, replica, relocating.
Here is a link.
https://www.elastic.co/guide/en/elasticsearch/reference/5.6/indices-recovery.html
So I checked to use this query.

GET /_recovery?human

but I saw different types (peer, empty_store...) in my Elasticsearch.
What happened?
I think peer is similar to replica, empty_store is similar to store. is it right?
please, explain me about indices recovery type.

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