[LUCENE-6317] Fix readStringStringMap api

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.1, 6.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Robert Muir
• Created: 01/Mar/15 13:14
• Updated: 28/Aug/22 14:27
• Resolved: 02/Mar/15 02:14

Description

Currently this api is not very efficient, and always returns a mutable map.

Can we change it to allow immutability? its sad we don't return Collections.emptyMap so its the same instance for all empty cases.