[LUCENE-4898] Allow DirectoryReader.openIfChanged to an IndexCommit when reader is NRT

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.3, 6.0
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 02/Apr/13 19:49
• Updated: 28/Aug/22 13:43
• Resolved: 04/Apr/13 11:04

Description

This throws an IllegalArRgumentException today, but it's easy to fix
with a small change to DirectoryReader. This is useful to do, if you
have an NRT reader and want to open a reader against a previous commit
point while sharing the SegmentReaders they have in common.