Thank you for your time in doing the Elasticsearch tutorial. It is very helpful. I installed it with no pain
However, after I installed it my memory usage jumped from 20% to 55% and I can’t install/update any modules via CLI.
The following message is shown.
“mmap() failed:  Cannot allocate memory”
My environment: Ubuntu 16:04, DigitalOcean 4GB, php_value memory_limit 2G for mod_php7.c
It looks like elastic search is very hungry for memory or I config something wrongly.
I want to use ES so I have to change the hosting plan in order to use it or is there a different way?
Can you give me a tip?