Elasticsearch cannot be shut down

Hi,

I used the command below to shut down the Elasticsearch
"curl -XPOST 'http://localhost:9200/_shutdown'"
But after a few seconds, a new cluster will be started automatically.

It seems that the Elasticsearch is running as a daemon, but I cannot find its PID using
" bin/elasticsearch -d -p pid "

I just found the solution:

https://groups.google.com/forum/#!topic/elasticsearch/Rwkef4PiiBM