This message popped up after I went from 6.1.1 to 6.20 across my internal splunk infrastructure.
My indexers, search head, deploy server, master are all 6.2.0.
My heavy forwarders are still a mix of 6.1.1, 6.1.5, and 6.2.0.
The heavy forwarders all report this error. It is really chatty.
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