Problem adding rivers

I'm working in a 12 server cluster, and I'm trying to restart Rivers and
running into a problem. I have 3 in particular that always seem to want to
go to the same host, and I can get two of them to work, but when I go to
add the 3rd, it doesn't get assigned to as host and never starts. If I
restart Elasticsearch on the host that it seems to prefer, then the 3rd one
starts, but the first two die. There are no errors in the Elasticsearch
log, it just stops receiving updates.
Is there a way to maybe force these 3 Rivers to go to other hosts? Or can
I look into this to see why they don't want to cooperate on the host
they're being assigned to? These are small subset of the total number of
Rivers that we're running, but it seems to either a problem with this host,
or these 3 rivers, but I don't have a clue where to start looking.

Any information you can provide would be appreciated.

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