How to turning hot node

I have a cluster include 7 hot nodes.
I tested with only 1 node, that config was: 1 shard/index ==> indexing document rate was: 17k documents/s,
But, when I push to 7 nodes with config: 7 shard/index (1 shard/ 1 node), node.master: true, true ==> each node has indexing document rate is: 9k documents/s

All both test case, replication number is 0

Can I increase indexing document rate?

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