check

Author: Thomas Reggi

lib/core/sdam/topology_description.js

@@ -150,8 +150,10 @@ class TopologyDescription {
 
     // update the actual server description
     serverDescriptions.set(address, serverDescription);
-
-    if (serverType === ServerType.Mongos && this.options._directConnection === false) {
+    const isReplicaSet = this.options.replicaSet || this.options.setName || this.options.rs_name;
+    // _directConnection is used to pass in the authored directConnection and not get the default
+    const isDirectConnection = this.options._directConnection === false;
+    if (serverType === ServerType.Mongos && !isReplicaSet && !isDirectConnection) {
       return new TopologyDescription(
         TopologyType.Sharded,
         serverDescriptions,