How do i amend mongo db using Java

How do i update the "Version" section of this database in mongo db? Ive tried creating a new collection but can t get it to work, any ideas? The name of the collection itself is document_revisions

{ "_id" : ObjectId("5afaa7fd3c670aa8c2bf9f08"), "type" : "PP", "revision" : { "date" : "2018-05-23T10:50:20.798Z", "version" : "1.4.23" }, "location" : "https://www.tetst.com/privacy-policy/" }