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https://issues.apache.org/jira/browse/LUCENE-9379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17173265#comment-17173265
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David Smiley commented on LUCENE-9379:
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Rajeswari -- you are referring to some SolrCloud concepts. The scenario you
describe would _often_ co-locate your "tenants", and thus any OS or Lucene
Directory or Codec levels simply +won't work+. For example if you had a field
"name" that's indexed, then it's an index for all docs in that index, spanning
your multiple "tenants". Instead, you could either create separate
Collections, or have one Collection with "implicit" (really explicit) shard
creation/naming for each tenant, but you'd have to be careful in all you do to
query/index a specific shard instead of accidentally querying the whole.
> Directory based approach for index encryption
> ---------------------------------------------
>
> Key: LUCENE-9379
> URL: https://issues.apache.org/jira/browse/LUCENE-9379
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Bruno Roustant
> Assignee: Bruno Roustant
> Priority: Major
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> +Important+: This Lucene Directory wrapper approach is to be considered only
> if an OS level encryption is not possible. OS level encryption better fits
> Lucene usage of OS cache, and thus is more performant.
> But there are some use-case where OS level encryption is not possible. This
> Jira issue was created to address those.
> ____________________________________________
>
> The goal is to provide optional encryption of the index, with a scope limited
> to an encryptable Lucene Directory wrapper.
> Encryption is at rest on disk, not in memory.
> This simple approach should fit any Codec as it would be orthogonal, without
> modifying APIs as much as possible.
> Use a standard encryption method. Limit perf/memory impact as much as
> possible.
> Determine how callers provide encryption keys. They must not be stored on
> disk.
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