Solr SubQuery Query Stage
The Solr SubQuery stage was renamed for Fusion 3.0; it was called the Sub Query stage in previous versions.
The Solr SubQuery stage is used to query external collections. The Solr SubQuery stage runs a query and adds the results to the pipeline Request object. The query must return results in JSON format, so that they can be added to the query pipeline.
When entering configuration values in the UI, use unescaped characters, such as