Partial failure

I have a 3 nodes cluster with 1 primary and 2 replica shards.
I inserted a document and got this response:

[indices:data/write/bulk[s][r]] disconnected"},"status":"INTERNAL_SERVER_ERROR","primary":false}]}]

I understand that only 1 shard was able to persist the document (the successful one...), 1 failed.
What about the third?
In addition, why 1 shard is written when didn't get ack from the rest of the nodes? I don't want to have this behavior.

What version are you on? How many shards and replicas in the index?

Version 5.4.
1 index with 1 primary shard and 2 replicas.
3 nodes in the cluster.

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