[LUCENE-2900] make applying deletes optional when pulling a new NRT reader

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.1, 4.0-ALPHA
• Component/s: core/index
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 30/Jan/11 17:34
• Updated: 28/Aug/22 12:40
• Resolved: 30/Jan/11 18:30

Description

Usually when you pull an NRT reader, you want all deletes to be applied.

But in some expert cases you may not need it (eg you just want to validate that the doc was indexed). Since it's costly to apply deletes, and trivial to add this boolean (we already have a boolean internally), I think we should add it.

The deletes are still buffered, and you can always later pull another reader (for "real" searching) with deletes applied.