With a standard LB in front of an N-node cluster, what's the best URL in 
the ES API to check the health of a particular node (so as to know to 
remove it at least temporarily).

There is the node info API:

curl -XGET 'http://localhost:9200/_nodes'

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/cluster-nodes-info.html

But that's returning node info for all the nodes in the cluster that 
localhost is a member of.  I want something like /_nodes/_current.  Or 
maybe the fact that a particular node can even process any GET request 
(e.g., http://localhost:9200/_cluster/health) signifies that it is 
responsive enough and can take requests?  

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