A query pipeline is made up of a series of query stages that process incoming search queries. A pipeline stage definition associates a unique ID with a set of properties. These definitions are registered with the Fusion API service and stored in ZooKeeper for re-use across pipelines and search applications. Fusion includes a number of specialized query stages as well as a JavaScript stage that allows advanced processing via a JavaScript program. Use the Query Workbench to configure stages in a query pipeline. See these reference topics for details about each query pipeline stage: