Once you decide that you no longer need a collection or that you want to start over, you can delete it. Deleting a collection will remove all the documents and indexes associated with it. To delete a collection, call the delete() function on client.collections() with the name of the collection: 
client.collections().delete("my-collection")
If your collection is too large it can take a moment to delete it. You can check the status of the deletion by listing the collections again.