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https://issues.apache.org/jira/browse/LUCENE-8031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16325975#comment-16325975
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Adrien Grand commented on LUCENE-8031:
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+1 to disallow downgrading
> DOCS_ONLY fields set incorrect length norms
> -------------------------------------------
>
> Key: LUCENE-8031
> URL: https://issues.apache.org/jira/browse/LUCENE-8031
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-8031.patch
>
>
> Term frequencies are discarded in the DOCS_ONLY case from the postings list
> but they still count against the length normalization, which looks like it
> may screw stuff up.
> I ran some quick experiments on LUCENE-8025, by encoding
> fieldInvertState.getUniqueTermCount() and it seemed worth fixing (e.g. 20% or
> 30% improvement potentially). Happy to do testing for real, if we want to fix.
> But this seems tricky, today you can downgrade to DOCS_ONLY on the fly, and
> its hard for me to think about that case (i think its generally screwed up
> besides this, but still).
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