anchor.diff:  
   [TIP]
   ====
  -Try to avoid task reassignment and reconfigurations while the connector is performing an intial sync of any replica sets. The connector does log messages with the progress of the initial sync. For utmost control, run a separate cluster of Kafka Connect for each connector.
  +Try to avoid task reassignment and reconfigurations while the connector is performing an initial sync of any replica sets. The connector does log messages with the progress of the initial sync. For utmost control, run a separate cluster of Kafka Connect for each connector.
   ====
   
   [[tailing-the-oplog]]
  
positive.code: 
  * `op` is a mandatory field that contains a string value describing the type of operation. Values for the MongoDB connector are `c` for create (or insert), `u` for update, `d` for delete, and `r` for read (in the case of a initial sync).
  * `after` is an optional field that if present contains the state of the document _after_ the event occurred. MongoDB's oplog entries only contain the full state of a document for _create_ events, so these are the only events that contain an _after_ field.
  * `source` is a mandatory field that conains a structure describing the source metadata for the event, which in the case of MongoDB contains several fields: the logical name, the replica set's name, the namespace of the collection, the MongoDB timestamp (and ordinal of the event within the timestamp) at which the event occurred, the identifier of the MongoDB operation (e.g., the `h` field in the oplog event), and the initial sync flag if the event resulted during an intial sync.
  * `ts_ms` is optional and if present contains the time (using the system clock in the JVM running the Kafka Connect task) at which the connector processed the event.
  
  And of course, the _schema_ portion of the event message's value contains a schema that decribes tihs envelope structure and the nested fields within it.
  
negative.code:     "connector.class": "io.debezium.connector.mongodb.MongoDbConnector", // <2>
      "mongodb.hosts": "rs0/192.168.99.100:27017", // <3>
      "mongodb.name": "fullfillment", // <4>
      "collection.whitelist": "inventory[.]*" // <5>
    }
  }
  ----
  