Below xml file is a logging configuration for the server log. Inside the xml file are the appenders that responsible to sending the log information to the server log. You may try to control some of the log information from being written in the server log by disabling the appender based on your use case scenario. Apart from that changing the logging from INFO to WARN or ERROR may also help to suppress the amount of logging message.
If you are using Repertoire 8.10 version
RepertoireServer\etc\logback.xml
If you are using below Repertoire 8.10 version
RepertoireServer\config\log-config.xml
Below link is some additional information for your reference.
For log4j
https://logging.apache.org/log4j/2.x/manual/configuration.html
For logback
https://logback.qos.ch/manual/configuration.html