Logstash hosts

While transferring data with Logstash, there is an increase in write threads on the node that is not in the output host list that I specified.
I do not want to transfer data over a single node. This causes me to experience slowness.
I want to distribute to multiple nodes. Do I need to specify this elsewhere than in the host list?

the hosts works as a cordinating node to distribute documents to appropriate data nodes containing the shards of the target index.

This is a problem of shard allocation of Elasticsearch cluster. And also, please recheck the number_of_shards settings of the target index is more than 1.

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