What gives the best search improvements?

As a follow-up question to this article: https://www.elastic.co/guide/en/elasticsearch/reference/current/tune-for-search-speed.html I would like to know which way to best improve search time for my ES database.

Would it be:

  1. To increase RAM or
  2. To add more nodes?

I currently have a 4 gb RAM one node setup.

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