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https://issues.apache.org/jira/browse/LUCENE-9127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17377204#comment-17377204
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samuel ma commented on LUCENE-9127:
-----------------------------------
[~erickerickson],
We have some 5/6x version index, and use IndexUpgrader to 7x, now we have this
issue to upgrade to 8x. One question is: if we force to ignore this
IndexFormatTooOldException, do you know is there any incompatible issues?
> index migration from 7 to 8 failing
> -----------------------------------
>
> Key: LUCENE-9127
> URL: https://issues.apache.org/jira/browse/LUCENE-9127
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 8.4
> Reporter: Niranjan
> Priority: Major
>
> we have been using solr4 for more than 16 year, now it is to time to upgrade,
> when we have decided to upgrade, started with migrating index from 4 -> 5, 5
> -> 6, 6 -> 7, it was working as expected, but when it comes to 7 -> 8 , it
> give me errors.
> {noformat}
> Exception in thread "main"
> org.apache.lucene.index.IndexFormatTooOldException: Format version is not
> supported (resource
> BufferedChecksumIndexInput(MMapIndexInput(path="/deploy/solrmaster/data/data/<name>/index/segments_4n"))):
> This index was initially created with Lucene 6.x while the current version
> is 8.4.0 and Lucene only supports reading the current and previous major
> versions.. This version of Lucene only supports indexes created with release
> 7.0 and later.{noformat}
> {noformat}
> java -cp ./lucene-core-8.4.0.jar:./lucene-backward-codecs-8.4.0.jar
> org.apache.lucene.index.IndexUpgrader /deploy/solrmaster/data/data/job/index
> -verbose {noformat}
>
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