node primaryChange value changes even if you don't really change the value

[Dieterbe]

dieter@rt-tsdb-poc-2:~$ curl "http://localhost:6060/node"
{"name":"rt-tsdb-poc-2","version":"0.6.0-50-g47b65e2","primary":true,"primaryChange":"2016-12-15T05:09:38.075808278-05:00","state":"NodeReady","started":"0001-01-01T00:00:00Z","stateChange":"2016-12-15T05:09:38.775892156-05:00","partitions":[0],"remoteAddress":""}dieter@rt-tsdb-poc-2:~$ 
dieter@rt-tsdb-poc-2:~$ 
dieter@rt-tsdb-poc-2:~$ curl --data primary=true "http://localhost:6060/node"
OKdieter@rt-tsdb-poc-2:~$ cur"http://localhost:6060/node"
{"name":"rt-tsdb-poc-2","version":"0.6.0-50-g47b65e2","primary":true,"primaryChange":"2016-12-20T10:37:11.449639742-05:00","state":"NodeReady","started":"0001-01-01T00:00:00Z","stateChange":"2016-12-15T05:09:38.775892156-05:00","partitions":[0],"remoteAddress":""}dieter@rt-tsdb-poc-2:~$