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https://issues.apache.org/jira/browse/LUCENE-8279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16453981#comment-16453981
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Adrien Grand commented on LUCENE-8279:
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Here is a patch. There is one case when terms and norms may go out-of-sync:
when a document fails indexing eg. because the consumption of the token stream
triggers an exception. In such a case you could end up with terms for this
document but no norm. Since IndexWriter immediately marks the document as
deleted in such a case, the new check only verifies that terms and norms agree
on live documents.
> Improve CheckIndex on norms
> ---------------------------
>
> Key: LUCENE-8279
> URL: https://issues.apache.org/jira/browse/LUCENE-8279
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-8279.patch
>
>
> We should improve CheckIndex to make sure that terms and norms agree on which
> documents have a value on an indexed field.
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