Setting connections.max.idle.ms does not work

[ezangills]

I'm trying to set connections.max.idle.ms property, but it doesn't seem to be working. According to kafka documentation all is needed is to add a prefix CONNECT_ and replace periods with underscores. Here's how I'm trying to set it in my docker-compose file:

environment:
      CONNECT_CONNECTIONS_MAX_IDLE_MS: 10000
...

but when I'm checking the logs of kafka connect the property is remaining unchanged:

[main] INFO org.apache.kafka.clients.admin.AdminClientConfig - AdminClientConfig values: 
        bootstrap.servers = [kafka:29092]
        client.dns.lookup = default
        client.id = 
        connections.max.idle.ms = 300000
...

Could you please point me to what I'm doing wrong here?

Thank you.

Update:

I also tried using following properties: CONNECT_ADMIN_OVERRIDE_CONNECTIONS_MAX_IDLE_MS CONNECT_CONSUMER_OVERRIDE_CONNECTIONS_MAX_IDLE_MS but this did not work as well.