What are elasticsearch node network stats?

When I get node stat in es with curl, the response is ;

curl -XGET 'http://localhost:9200/_nodes/stats/network?human&pretty'

{
"cluster_name" : "elasticsearch",
"nodes" : {
"XpAeeHs6Q7WxycqJBOShfA" : {
"timestamp" : 1411385146836,
"name" : "Ape-X",
"transport_address" : "inet[/192.168.0.149:9300]",
"host" : "test",
"ip" : [ "inet[/192.168.0.149:9300]", "NONE" ],
"network" : {
"tcp" : {
"active_opens" : 93920,
"passive_opens" : 39,
"curr_estab" : 62,
"in_segs" : 7053825,
"out_segs" : 4536915,
"retrans_segs" : 4948,
"estab_resets" : 1572,
"attempt_fails" : 523,
"in_errs" : 708,
"out_rsts" : 48488
}
}
}
}
}

I checked it with "netstat -anlp" command. There was not any connection to
9200 or 9500 ports. However "curr_estab" is 62. Does "curr_estab" show
current established network? I looked in documentation for parameters
"active_opens", "passive_opens" and "curr_estab" but I couldn't find any.
What these parameters represents in elasticsearch?

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