[LUCENE-1761] low level Field metadata is never removed from index

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.2, 2.3, 2.3.1, 2.3.2, 2.4, 2.4.1
• Component/s: core/index
• Labels: gsoc2014
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Chris M. Hostetter
• Created: 25/Jul/09 03:27
• Updated: 28/Aug/22 12:04

Description

with heterogeneous docs, or an index whose fields evolve over time, field names that are no longer used (ie: all docs that ever referenced them have been deleted) still show up when you use IndexReader.getFieldNames.

It seems logical that segment merging should only preserve metadata about fields that actually existing the new segment, but even after deleting all documents from an index and optimizing the old field names are still present.