CPU utilization always high

HI guys,

I have around 20 index and 5 shards for each index, each shard takes bout 80-100 mb, data will grow exponentially in future, how many nodes should i have?
Currently i have only 1 node and i am doing many search query and bulk updates parallely.
Please suggest.

Welcome!

May I suggest you look at the following resources about sizing:

https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing

And https://www.elastic.co/webinars/using-rally-to-get-your-elasticsearch-cluster-size-right

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