Input the data into Elastic

I have an elastic cluster with 3 master nodes, ten data nodes, and of these three are ingest too. But all nodes accept data in elastic open port. I used in the logstash output master:port and node:port, always _docs was included in the index.
My question is, in this cluster which node is more recommended to input datas?

Thank you for your attention.

I'd probably send everything to the ingest nodes.

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