Zend certified PHP/Magento developer

Elasticsearch issue with 5k Products

Currently, We have 5k Products on our store and we will upload more products on our store.

I have just upgraded to
8g Ram
80g SSD
4 vCPUs

from 4g ram and others same.

Elasticsearch was getting killed after sometimes.
now its much more stable after upgrading but it’s still crashing occasionally.
We are currently using digital ocean for hosting. Digital ocean is very costly. what will be the best and good plan?

How about Magento Clusters?