Es7.5.1 _refresh taking 10+ seconds

Hi, when I indexing a doc with refresh=true, it always take more than 10 seconds to response from my EsCluster (5 nodes each 8c32g) with all default settings.
and if set refresh=false, it would take more than 40 seconds to get from the cluster.
this cluster has one index with 10shards. Anyone could give some advice?

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