ES cluster becomes unresponsive

I have a weird problem with my ES cluster.

I can connect to the API fine, doing a XGET shows the cluster is healthy:

"cluster_name" : "_name",
"status" : "green",
"timed_out" : false,
"number_of_nodes" : 4,
"number_of_data_nodes" : 3,
"active_primary_shards" : 6,
"active_shards" : 12,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 0

However when connecting with elasticsearch-head, I get no output from the
interface. Paramedic also shows zero data.

What logging can I turn on in ES to determine what the problem might be?

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