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You may leverage the operating system (Red Hat Enterprise Linux) capabilities for handling encryption of data at rest based on , such as LUKS Disk Encryption.
The following links provide more information on that topic:
- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/security_guide/sec-encryption
- https://www.redhat.com/sysadmin/disk-encryption-luks
- https://opendistro.github.io/for-elasticsearch-docs/docs/install/encryption-at-rest/
Please make sure to use xfs file system where required to match the product prerequisites.