anchor.diff:  In addition to having Processors that are able to extract particular pieces of information from FlowFile content into Attributes,
   it is also common for users to want to add their own user-defined Attributes to each FlowFile at a particular place in the flow.
   The UpdateAttribute Processor is designed specifically for this purpose. Users are able to add a new property to the Processor
  -in the Configure dialog by clicking the "New Property" button in the top-right corner of the Properties tab. The user is then
  +in the Configure dialog by clicking the "+" button in the top-right corner of the Properties tab. The user is then
   prompted to enter the name of the property and then a value. For each FlowFile that is processed by this UpdateAttribute
   Processor, an Attribute will be added for each user-defined property. The name of the Attribute will be the same as the name of
   the property that was added. The value of the Attribute will be the same as the value of the property.
  
positive.code: === Adding a Processor
  
  We can now begin creating our dataflow by adding a Processor to our canvas. To do this, drag the Processor icon
  image:iconProcessor.png["Processor"] from the top-left of the screen into the middle of the canvas (the graph paper-like
  background) and drop it there. This will give us a dialog that allows us to choose which Processor we want to add:
  
  image:add-processor.png["Add Processor"]
  
negative.code: image:provenance-table.png[Provenance Table]
  
  Initially, this table is populated with the most recent 1,000 Provenance Events that have occurred (though it may take a few
  seconds for the information to be processed after the events occur). From this dialog, there is a `Search` button that allows the
  user to search for events that happened by a particular Processor, for a particular FlowFile by filename or UUID, or several other
  fields. The `nifi.properties` file provides the ability to configure which of these properties are indexed, or made searchable.
  Additionally, the properties file also allows you to choose specific FlowFile Attributes that will be indexed. As a result, you can
  