Erick Erickson commented on LUCENE-8253:


I'm deep in the guts of TieredMergePolicy for LUCENE-7976 so wanted to check 
something. I took a _very_ quick scan through the patch and it doesn't look 
like this affects TieredMergePolicy at all. do you agree? All the work in TMP 
is just around creating a list of segments to merge and returning them to the 
serious merging code...

> ForceMergeDeletes does not merge soft-deleted segments
> ------------------------------------------------------
>                 Key: LUCENE-8253
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8253
>             Project: Lucene - Core
>          Issue Type: Bug
>    Affects Versions: 7.4, master (8.0)
>            Reporter: Nhat Nguyen
>            Priority: Major
>         Attachments: LUCENE-8253.patch, test-merge.patch
> IndexWriter#forceMergeDeletes should merge segments having soft-deleted 
> documents as hard-deleted documents if we configured "softDeletesField" in an 
> IndexWriterConfig.
> Attached is a failed test.

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