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https://issues.apache.org/jira/browse/LUCENE-8569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer resolved LUCENE-8569.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 7.7
                   master (8.0)

>  Never count soft-deletes if reader has no hard-deletes
> -------------------------------------------------------
>
>                 Key: LUCENE-8569
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8569
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: 7.5, master (8.0)
>            Reporter: Simon Willnauer
>            Priority: Major
>             Fix For: master (8.0), 7.7
>
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
>  Today we count the actual soft-deletes during a merge which is
>     unnecessary if there are no hard-deletes present. In this case, which
>     is considered to be the common case we can get accurate counts by 
> substracting
>     the number of deleted docs in the wrapped reader from the number of 
> soft-deletes
>     in that reader.



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