Details
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Type:
Improvement
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Status: Resolved
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Priority:
Major
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Resolution: Won't Fix
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Affects Version/s: 7.3, 8.0
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Fix Version/s: None
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Component/s: None
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Labels:None
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Lucene Fields:New
Description
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.