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https://issues.apache.org/jira/browse/LUCENE-7872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16051512#comment-16051512
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Adrien Grand commented on LUCENE-7872:
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[~hossman] Doesn't {{DocList}} only represent results from a single shard? In
that case, keeping an int would still work since the number of docs in a shard
is still bound by the integer max value. We only have the issue with TopDocs
because it is sometimes used to represent top results for the union of multiple
shards because of {{TopDocs#merge}}.
> TopDocs.totalHits should be a long
> ----------------------------------
>
> Key: LUCENE-7872
> URL: https://issues.apache.org/jira/browse/LUCENE-7872
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-7872.patch, LUCENE-7872.patch
>
>
> Even though a single index cannot have more than 2B documents, TopDocs.merge
> might merge TopDocs instances that have more than 2B documents in total.
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