chore(shell-api): show warning when connection is not mongos MONGOSH-1328 (#2097)

* show error when connection is not mongos

* warn when user is not connected to mongos

Author: mabaasit

packages/shell-api/src/collection.ts

@@ -42,6 +42,7 @@ import {
   buildConfigChunksCollectionMatch,
   onlyShardedCollectionsInConfigFilter,
   aggregateBackgroundOptionNotSupportedHelp,
+  getConfigDB,
 } from './helpers';
 import type {
   AnyBulkWriteOperation,
@@ -2076,6 +2077,8 @@ export default class Collection extends ShellApiWithMongoClass {
   async getShardDistribution(): Promise<CommandResult> {
     this._emitCollectionApiCall('getShardDistribution', {});
 
+    await getConfigDB(this._database); // Warns if not connected to mongos
+
     const result = {} as Document;
     const config = this._mongo.getDB('config');
     const ns = `${this._database._name}.${this._name}`;