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To find the PID, try this:
ps -ef | grep elasticsearch | xargs | awk '{print $2}'
To kill it:
sudo kill -9 PID
I have little experience with Mac. This link may help in finding a proper way to stop a daemon:
http://elasticsearch-users.115913.n3.nabble.com/Cannot-kill-ElasticSearch-process-Mac-OS-X-es-version-0-19-10-td4028808.html
Source:stackexchange.com