Problem

Upon Confluence startup, following error message appears in the catalina.out: 

log4j:ERROR Could not find value for key log4j.appender.luceneQuery
log4j:ERROR Could not instantiate appender named "luceneQuery"

• Confluence was updated from 6.15.5 to 7.14.0. 
• Same error message seen with the fresh installation of Confluence 7.13 also.

Environment

• Confluence 7.13.x and 7.14

Steps to Reproduce

1. Start the Confluence.
2. Check the catalina logs

Expected Results

As these errors are not causing any issue, it should not be printed in the logs. 

Actual Results

No side effect caused by these error but printed in the catalina logs which caused confusion for admins. 

Workaround

(Add a workaround, if available)

Notes 

The above error comes from the log4j configuration that is related to Lucene query logging. It is safe to ignore this error unless Lucene query logging is needed.