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This allows updating only specific fields, which can help speed indexing processes in an environment where speed of index additions is critical to the application.
To use atomic updates, add a modifier to the field that needs to be updated.
When replacing a document, the replacement document must consist of only field/value pairs; i.e. The replacement document can have different fields from the original document.
In the replacement document, you can omit the and no documents match the specified filter, then the operation creates a new document and inserts it.
If there are matching documents, then the operation modifies or replaces the matching document or documents.
For details on the new document created, see the individual reference pages for the methods.
From an application point of view nothing needs to be changed when working with the response, although there is something that need to be kept in mind: The internal implementation first performs a regular // Insert the document and make sure it is persisted to the master node bucket.replace(document, Persist To.
and no documents match the specified filter, then the operation creates a new document and inserts it.The content can be updated, added to, or incrementally increased if a number.Set or replace the field value(s) with the specified value(s), or remove the values if 'null' or empty list is specified as the new value. These types create additional fields which are normally specified by a dynamic field definition.For example, you cannot specify different collations per field, or if performing a find with a sort, you cannot use one collation for the find and another for the sort.document is well-defined and not bound to the order specified in the query If you attempt to insert a document in this way, Mongo DB will raise an error.