[LUCENE-10017] Do not check footers on Lucene7x segments when throwing IndexFormatTooOld

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 9.0
• Fix Version/s: 9.0
• Component/s: core/index
• Lucene Fields: New
• Assignee: Mike Drob
• Reporter: Mike Drob
• Created: 01/Jul/21 22:10
• Updated: 28/Aug/22 16:23
• Resolved: 20/Aug/21 20:41

Description

Ran into this while investigating how to improve the logging situation in SOLR-15516

When we throw an IndexFormatTooOldException when attempting to read a segment, we will read still attempt to read the footer since it is newer than 7x (which AFAIUI was the oldest version to support these footers?)

We should update that to only check footers for versions newer than 8x, otherwise we create a needless additional exception.

Issue Links

• relates to: SOLR-15516 Logging for IndexTooOld is way too verbose
• links to: GitHub Pull Request #200