Unallocated shards with empty nodes

https://lh6.googleusercontent.com/-adNxVo3OpSc/U-o2sO7TcMI/AAAAAAAABJ4/woxOBumFC80/s1600/head.png
As you can see by the image snapped from 'head,' I have unallocated shards
while a couple of nodes are empty. This happened when I recycled some
nodes. The last two indexes are freshly-created and look good. (5 shards, 5
replicas + master).

Nothing I do gets those unallocated shards back on a node.

Anyone have a clue as to what I'm doing wrong?

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To add a little more information, the six nodes are broken up into three
groups. The first two have node.zone: first, the second are node.zone:
second and the third are node.zone: third.

I also have "cluster.routing.allocation.awareness.attributes: zone" in my
config.

So as you can see, the empty nodes are the two that are "node.zone: second"
in their config file.

Could this be involved?

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Nobody?

I've seen many people posting with similar issues - has nobody encountered
this?

Anyone from ES care to comment?

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