GET API with refresh call

I want to use the GET API but I realise that a refresh call is made every time and it causes heavy performance problems. The first question is why is a refresh necessary? (I think that the request go to the primary shard and the doc is in memory in that time) and the second question: Is there a way to avoid the refresh call? (the refresh=false parameter is not working)
(The elastic version is 5.6.0)

Thanks!

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