Elasticsearch CCR synchronization

I have a couple of questions about how the CCR works.
Does it uses a polling strategy? or whenever there is a new log it will be pushed to the remote cluster?

In case is a polling strategy how can reduce the polling delay? Do I have to modify this options "read_poll_timeout" : "1m" in the follow pattern?

What is the max time to wait to have both cluster sync (assuming that I have a log every 2 minutes for example)? Is it immediate?

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