Solr SubQuery Stage
This stage was renamed to Solr SubQuery in Fusion 3.0. It was called the Sub Query stage in prior Fusion versions.
The Solr SubQuery query pipeline 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