[LUCENE-8282] Reduce boxing and unnecessary object creation in DV updates

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 7.4, 8.0
• Fix Version/s: 7.4, 8.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Simon Willnauer
• Created: 27/Apr/18 08:04
• Updated: 28/Aug/22 15:29
• Resolved: 30/Apr/18 09:59

Description

DV updates used the boxed type Long to keep API generic. Yet, the missing
type caused a lot of code duplication, boxing and unnecessary object creation.
This change cuts over to type safe APIs using BytesRef and long (the primitive)

In this change most of the code that is almost identical between binary and numeric
is not shared reducing the maintenance overhead and likelihood of introducing bugs.