Is the data stored by Lucene in file system readable/is plain text or is encrypted/unreadable?

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1

I need to store some sensitive data in elasticsearch.
Since data is actually stored by Lucene in file-system, is it in plain text/Json format that is readable if i access the file system directly or is it encrypted/garbled to make it unreadable?

2

You can find the Lucene index files format at https://lucene.apache.org/core/7_1_0/core/org/apache/lucene/codecs/lucene70/package-summary.html

3

It's readable.
You might use dm-crypt if you want to encrypt your FS.

4

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