how to use conn.db.admin().command() on secondary in replica set?
Added Read Preference and Replicaset name in Connection String
https://mongoosejs.com/docs/connections.html#connection-string-optionshttps://mongoosejs.com/docs/api.html#query_Query-read
var options = { "db": { "readPreference": "secondaryPreferred" }, "replset": { "rs_name": "replica_name", } } var connection = mongoose.createConnection(`mongodb://localhost:27030/dbname`, options);