Mongo upsert support

[lveraszto]

Hello,

i would like to use this plugin in google cloud data fusion as a sink. As i see this lib work only with insert.
Is is possible to use upsert?
Can i give somehow few columns and when the values of these columns are equal than update the row and not inserting a new one?
(Maybe with this one https://api.mongodb.com/hadoop/r2.0.0/core/com/mongodb/hadoop/io/MongoUpdateWritable.html? )

Thanks