Log SQL queries which are created with flex

You can add below properties to your local.properties file.

log4j2.config.xml=
log4j2.logger.flexible-search.name = de.hybris.platform.jalo.flexiblesearch
log4j2.logger.flexible-search.level = debug
log4j2.logger.flexible-search.appenderRef.stdout.ref = STDOUT

After configuration you can manage log level in hac.