[SPARK-49898] Correct documentation and default for event log task metrics accumulator logging flag from SPARK-42204

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0
• Fix Version/s: 4.0.0
• Component/s: Spark Core
• Assignee: Josh Rosen
• Reporter: Josh Rosen
• Created: 07/Oct/24 18:20
• Updated: 08/Oct/24 08:28
• Resolved: 08/Oct/24 08:28

Description

https://issues.apache.org/jira/browse/SPARK-42204 intended only to add a flag but not to change default behavior, but I made a mistake related to double-negation and accidentally set the opposite of the intended default.

Thus, this Jira / PR corrects the code to roll back the unintentional behavior change and updates the documentation accordingly.