As part of SERVER-74368, work was done to reduce log verbosity for virtual collection queries. The create/drop collection logs were set to be DEBUG for virtual collections, and the "Named pipe is closed" log was deduplicated. 

At this point, the ADF (Atlas Data Federation) + compute mode mongod system has been stable for a while, and we can set all virtual collection query logs to be DEBUG level to reduce the number of logs we output and ultimately reduce pressure on the splunk instances. 

Update:
Please, note that we have ERROR/WARNING/INFO/DEBUG1-5 log levels and we can disable logging only for DEBUG levels. "Named pipe is closed" log messages was an INFO level, which potentially pollute logs in splunk instances.