I am sure this is a basic question but I just don't see it answered in any clear way.
We are running a Ruby on Rails 5 app using the elasticsearch-rails gem. We have a cluster of 3 machines for ElasticSearch.
Can we point the 'elasticsearch url' at any of these 3 machines? If I am reading things right there is no concept of master and slave, so, in theory we can use any of them.
Really this is part of a larger question of what is a cluster and what good is it! Our 2nd and 3rd machines in the cluster seem to have almost no CPU/IO activity while our 1st machine (the one pointed to) is getting hit quite hard. We were hoping to someone spread all the load.