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https://issues.apache.org/jira/browse/LUCENE-8671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16772641#comment-16772641
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Ankit Jain commented on LUCENE-8671:
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[~mikemccand] Also, I'm wondering if we need per field setting now. Since, as
part of [^LUCENE-8635] offheap is default for non PK eligible fields, we can
keep it simple by having index level setting which if set to true, puts PK
eligible fields offheap as well?
> Add setting for moving FST offheap/onheap
> -----------------------------------------
>
> Key: LUCENE-8671
> URL: https://issues.apache.org/jira/browse/LUCENE-8671
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/FSTs, core/store
> Reporter: Ankit Jain
> Priority: Minor
> Attachments: offheap_generic_settings.patch, offheap_settings.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> While LUCENE-8635, adds support for loading FST offheap using mmap, users do
> not have the flexibility to specify fields for which FST needs to be
> offheap. This allows users to tune heap usage as per their workload.
> Ideal way will be to add an attribute to FieldInfo, where we have
> put/getAttribute. Then FieldReader can inspect the FieldInfo and pass the
> appropriate On/OffHeapStore when creating its FST. It can support special
> keywords like ALL/NONE.
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