Attempted to send event to pipeline

I'm using Centralized Pipeline Management. I updated a pipeline (pipeline-1) that started sending events to another pipeline (pipeline-2). I didn't have pipeline-2 in my logstash.yml file, so Logstash didn't know about it, resulting in lots of these log messages:

[2021-01-25T09:02:10,084][WARN ][org.logstash.plugins.pipeline.PipelineBus][pipeline-1][eea5877602780] Attempted to send event to 'pipeline-2' but that address was unavailable. Maybe the destination pipeline is down or stopping? Will Retry.

I then updated pipeline-1 to send events to a working pipeline (pipeline-3), but these log messages persist. Wouldn't Logstash be able to redirect the messages from pipeline-2 over to pipeline-3? Thus flushing this problem scenario?

Or what's an alternative to get out of this scenario?

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