Simon Willnauer created LUCENE-8198:

             Summary: Add ability to persist deletes across merges
                 Key: LUCENE-8198
             Project: Lucene - Core
          Issue Type: Improvement
    Affects Versions: 7.3, master (8.0)
            Reporter: Simon Willnauer
            Assignee: Simon Willnauer

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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