Not really, depends on the size of the dataset and the complexity of the operations - when did you use it? Sounds like you were on a dodgy build or set up
I think Elastisearches policy on sizing is pay us or a partner to have a look and give you a guesstimate, which is pretty standard
Is there a way to know how much RAM you are going to need for your dataset? I think I was using it for looking up restaurant names from a database of 100,000 and I wanted to factor in misspellings and partial matches.