X-pack sounds great but I believe I read its best to install on separate server to my ES cluster? I dont have a spare VM at the moment.
I don't want to reload my current cluster at the moment as well, and I believe this is manditory when installing X-pack?

I found the following command that does what I need, maybe useful for others too:
curl -XGET 'localhost:9200/_cat/count/twitter?v&pretty'

I can initiate this count command and see per second, what has been written to my index, easy to calculate per second the write.