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https://issues.apache.org/jira/browse/LUCENE-10017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17373102#comment-17373102
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Mike Drob commented on LUCENE-10017:
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It looks like the actual index versions in the footer don't let us
differentiate between arbitrary 7x and an 8x, there's a [big
jump|https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/index/SegmentInfos.java#L123]
from 7.4 to 8.6 in the file metadata.
One option is to just explicitly check for IFTOE before adding a suppressed
corrupted index exception, which I'll put up as a PR. Maybe there's a better
heuristic to use instead.
> Do not check footers on Lucene7x segments when throwing IndexFormatTooOld
> -------------------------------------------------------------------------
>
> Key: LUCENE-10017
> URL: https://issues.apache.org/jira/browse/LUCENE-10017
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Affects Versions: main (9.0)
> Reporter: Mike Drob
> Priority: Major
>
> Ran into this while investigating how to improve the logging situation in
> SOLR-15516
> When we throw an IndexFormatTooOldException when attempting to read a
> segment, we will read still attempt to read the footer since it is newer than
> 7x (which AFAIUI was the oldest version to support these footers?)
> We should update that to only check footers for versions newer than 8x,
> otherwise we create a needless additional exception.
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