A set of filters specifying to which array elements an update should apply.
If true, allows the write to opt-out of document level validation.
Collation allows users to specify language-specific rules for string comparison, such as rules for letter-case and accent marks.
Users can specify an arbitrary string to help trace the operation through the database profiler, currentOp, and logs.
The index to use. Specify either the index name as a string or the index key pattern.
When true, creates a new document if no document matches the query.
A document that expresses the write concern of the insert command. Omit to use the default write concern.