[LUCENE-9476] Add a bulk ordinal->FacetLabel API

• Type: Improvement
• Status: Reopened
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 8.6.1
• Component/s: modules/facet
• Labels: performance
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Gautam Worah
• Created: 24/Aug/20 01:07
• Updated: 05/Oct/20 23:39

Description

This issue is a spillover from the PR for LUCENE 9450

The idea here is to share a single BinaryDocValues instance per leaf per query instead of creating a new one each time in the DirectoryTaxonomyReader.

Suggested by Michael McCandless