Disk space utilisation of an Elasticsearch Index

Is there a way to calculate the amount of space that an elasticsearch index will need based on the log file size and the number of fields that are being extracted from the log texts.

It's better to try by indexing few thousands of documents and you'll get a good idea.

I am doing it that way but i just want to know if there is a way to do capacity estimation like Oracle ...

Not really because it depends on a lot of factors. One of them is the compression of the _source field. Another one is the mapping and the analyzers you are using for each field...

Our solution architects do have some ways based on their experience to give an estimation but there's nothing better than trying on real data.

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