Simon Willnauer created LUCENE-8198:
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Summary: 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
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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