Kafka source doesn't start consuming after creation via REST API

[Kimishu]

I have a service that automatically handles quickwit index existence. If quickwit index doesn't exist, it automatically creates index + kafka-source for it via REST API. The problem is that I decided to check kafka topic's consumers and it's empty.
Here is my kafka-source config:

{
  "version": "0.8",
  "source_id": "kafka-test",
  "source_type": "kafka",
  "params": {
    "topic": "test",
    "client_params": {
      "bootstrap.servers": "kafka:9092"
    }
  }
}

I don't know where the problem is. If i'm right, quickwit has 1 consumer by default, and I don't want it to have more consumers to reduce hardware load.
Also, I pinged kafka in the quickwit docker-container and it worked, the domain name resolved successfully, so quickwit sees kafka.
Maybe I missed something?