This is a record pipeline step
You might find that some empty data has been stored in your index. For example, if you have a website collection with some custom metadata stored on some pages:
<meta name="primary-topic" data-sj-field="category" content="Kids,Books,Fiction">
But which is empty on other pages:
<meta name="primary-topic" data-sj-field="category">
This data will still be stored in the index as so:
If you are building a search interface using category
as a facet, you will find there is empty string in the faceting.
To get around this, we ca exclude