参数

server

An array containing the basic information about the server that was picked.

key	value
hash	server hash, example: localhost:27017;-;X;56052
type	Node type (primary/secondary/mongos/arbiter): 2
max_bson_size	The maximum BSON Size over the wire this node accepts: 16777216
max_message_size	The maximum Message Size over the wire this node accepts: 48000000
request_id	The request identifier for this message: 42

writeOptions

key	value
ordered	boolean, if the operation (in case of batch operation) must be executed sequentually (ordered=true)
writeConcern	An array of writeConcern options (see below)

writeConcern array values

key	value
fsync	boolean, force flushing to disk before returning
j	boolean, force journal write before returning
wtimeout	integer, milliseconds, maximum time the primary is allowed to wait to verify replication
w	integer=server count, or string=replication-tag

updateOptions

key	value
multi	Boolean, true if this update is allowed to update all matched criteria
upsert	Boolean, true if the document should be created if criteria does not match
q	Array, the search criteria
u	Array, the new object/modifications

protocolOptions

key	value
message_length	The total size (in bytes) of the encoded message being sent over the wire
request_id	The request identifier for this message: 42
namespace	The MongoDB namespace used for the protocol message dbname.collectionname