Robert Muir commented on LUCENE-8198:

The other advantage of the DV field would be at query-time, if it could be 
incorporated into the index sort.

If someone has a lot of these documents sticking around that should be filtered 
out, it would allow segments to be early-terminated based on a maxDocID rather 
than filtered out one-by-one.

Otherwise i am concerned that searching would just get slower and slower :)

> Add ability to persist deletes across merges
> --------------------------------------------
>                 Key: LUCENE-8198
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8198
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: 7.3, master (8.0)
>            Reporter: Simon Willnauer
>            Assignee: Simon Willnauer
>            Priority: Major
>         Attachments: LUCENE-8198.patch
> This allows conditionally persist deletes on a per document basis to prevent 
> them from being merged away. This expert feature is useful to maintain 
> history of documents in the index where otherwise a duplicate storage 
> mechanism would be needed. For instance features like CouchDBs changes API 
> can be build on top of persistent deletes. While using persistent deletes has 
> a considerably small overhead at merge time or when deletes applied to fully 
> deleted segments, there is no impact if persistent deletes are unused.

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