...
This field can be left empty, but it is the place where you can define what the metadata fields returned from your extractor mean.
process
Controls when/how an extractor is submitted based on Clowder events. To see a full list of event types refer to Extractor Basics. In the example above, the word count extractor is processed manually on a single file. Below is an example of starting an extractor automatically when a file is added to a dataset:
...