I'm not familiar with the index part, but you can get at least 2TB on a single CPU socket these days. You shouldn't need multiple machines to fit in RAM. Depend

I'm not familiar with the index part, but you can get at least 2TB on a single CPU socket these days. You shouldn't need multiple machines to fit in RAM. Depending on what QPS you need to handle, you might also be fine to not have the whole thing fit in RAM.