What does createdCollectionAutomatically mean in MongoDB?

If a collection does not exist then MongoDB creates a collection in indexing part. The createdCollectionAutomatically tells that the operation created a collection.

For our example, let us create a collection with an index −

> db.createCollectionDemo.createIndex({"ClientCountryName":1});

This will produce the following output −

{    "createdCollectionAutomatically" : true,    "numIndexesBefore" : 1,    "numIndexesAfter" : 2,    "ok" : 1 }

Let us create a collection with documents −

> db.createCollectionDemo.insertOne({"ClientName":"Larry","ClientCountryName":"US"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd2950be3526dbddbbfb612") }

Following is the query to display all documents from a collection with the help of find() method −

> db.createCollectionDemo.find().pretty();

This will produce the following output −

{    "_id" : ObjectId("5cd2950be3526dbddbbfb612"),    "ClientName" : "Larry",    "ClientCountryName" : "US" }