I don't have issues with forcemerge, is work for me as well.
My question about this topic is the following:
I applied the following command:
`curl -XPOST 'http://localhost:9200/logstash-2016.06.06/_forcemerge?only_expunge_deletes=true'
It takes around 4 hours, because I expunge around 100 million documents or more, so, exists some method to know if the forcemerge is still working?. I want to know when the process finish, I was thinking send me an e-mail when the forcemerge is finished