The ExtensionCallMarkLogic processor has been deprecated as of the 1.16.3.1 release. It allows for a MarkLogic REST extension to be invoked, but it appends the output of the call to the incoming FlowFile as opposed to creating a new FlowFile that contains the output. CallRestExtensionMarkLogic should be used instead.

For full details on each property and relationship for this processor, add an instance of it to the NiFi canvas, right-click on it, and select “View Usage”.