[LUCENE-8484] Drop fully deleted reader in SubReaderWrapper

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 7.5, 8.0
• Fix Version/s: 7.5, 8.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Simon Willnauer
• Created: 04/Sep/18 13:14
• Updated: 28/Aug/22 15:35
• Resolved: 19/Sep/18 14:13

Description

Today we can only wrap readers in SubReaderWrapper but never filter them out
entirely. This causes a invariant for soft-deletes that exposes fully deleted
segments with SoftDeletesDirectoryReaderWrapper. This change drops fully deleted readers after they are wrapped.

Issue Links

• relates to: LUCENE-8506 TestAddIndexes.testAddIndicesWithSoftDeletes() failures
• links to: GitHub Pull Request #445