anchor.diff:  	"op": "u",
   	"source": {
   		...
  -	}
  -	"ts_ms": "..."
  -	"before": {
  -		"field1", "oldvalue1",
  -		"field2", "oldvalue2"
  -	}
  -	"after": {
  -		"field1", "newvalue1",
  -		"field2", "newvalue2"
  +	},
  +	"ts_ms" : "...",
  +	"before" : {
  +		"field1" : "oldvalue1",
  +		"field2" : "oldvalue2"
  +	},
  +	"after" : {
  +		"field1" : "newvalue1",
  +		"field2" : "newvalue2"
   	}
   }
   ----
  
positive.code: 
  [NOTE]
  ====
  This SMT is supported only for SQL database plug-ins, not with MongoDB plug-in.
  ====
  
  Debezium generates a data change in a form of a complex message structure. The message consists of three parts
  
  * operation and metadata
  * the row data before change
  * the row data after change
  
  The general message structure for `update` change can look like
  
  [source,json,indent=0]
  ----
  
negative.code: ====
  
  == Configuration options
  [cols="35%a,10%a,55%a",width=100,options="header,footer",role="table table-bordered table-striped"]
  |=======================
  |Property
  |Default
  |Description
  
  |`drop.tombstones`
  |`true`
  |The SMT removes the tombstone generated by Debezium from the stream.
  
  |`drop.deletes`
  |`true`
  |The SMT removes the `d` record generated by Debezium (and converted to tombstone by the SMT) from the stream.
  |=======================
  