[LUCENE-9484] Allow index sorting to happen after the fact

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 9.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Simon Willnauer
• Created: 26/Aug/20 11:33
• Updated: 28/Aug/22 16:06
• Resolved: 08/Dec/21 17:43

Description

I did look into sorting an index after it was created and found that with some smallish modifications we can actually allow that by piggibacking on SortingLeafReader and addIndices in a pretty straight-forward and simple way. With some smallish modifications / fixes to SortingLeafReader we can just merge and unsorted index into a sorted index using a fresh index writer.

Issue Links

• relates to: SOLR-12239 Enabling index sorting causes "segment not sorted with indexSort=null"
• links to: GitHub Pull Request #1789