Is there any calculator for disk space requirement for ES? For example for each k number of docs with n number of fields we ll need x GB. Can you give an example?
Also how do we specify the retention policy for the documents?
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No, there is not, as it depends on a number of factors. Best way is to find out is to index a sample of your data and see. make sure that you index a good amount of data (at least a few tens of MB) as compression generally improves with shard size. You might be interested in the following resources:
https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing
https://www.elastic.co/guide/en/elasticsearch/reference/6.2/tune-for-disk-usage.html
For managing retention, I would recommend you look into Curator.
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