[LUCENE-8237] Add a SoftDeletesDirectoryReaderWrapper

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 7.4, 8.0
• Fix Version/s: 7.4, 8.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Simon Willnauer
• Created: 04/Apr/18 14:34
• Updated: 28/Aug/22 15:27
• Resolved: 09/Apr/18 10:07

Description

This adds support for soft deletes if the reader is opened form a directory.
Today we only support soft deletes for NRT readers, this change allows to wrap
existing DirectoryReader with a SoftDeletesDirectoryReaderWrapper to also filter
out soft deletes in the case of a non-NRT reader.