Hello. I have been observing strange pairs of records on one of the second nodes for several days.
She is hidden and the following pair of entries comes to her log every 5 minutes
2020-07-29T14: 26: 35.983 + 0300 I NETWORK [LogicalSessionCacheRefresh] Successfully connected to mong
o-prod01.work-yc.cxm: 27017 (1 connections now open to mongo-prod01.work-yc.cxm: 27017 with a 0 second
timeout)
2020-07-29T14: 26: 36.069 + 0300 I NETWORK [LogicalSessionCacheRefresh] scoped connection to mongo-pro
d01.work-yc.cxm: 27017 not being returned to the pool
2020-07-29T14: 26: 36.069 + 0300 I CONTROL [LogicalSessionCacheRefresh] Failed to refresh session cach
e: Location13111: wrong type for field (expireAfterSeconds) long! = int

In theory, a backup is made from it. And I'm not sure if it will be created without errors. I was unable to find the problem.
Those. I don't even know how I can get to it.

I tried to delete db.system.sessions.dropIndex ("lsidTTLIndex"), but the system does not want to authorize me