Adding or upgrading the Experience Optimization Query Service
Upgrading Experience Optimization includes upgrading the Query Service. The process is the same regardless of the version from which you are upgrading and involves installing a fresh instance of the Query Service.
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The preferred installation setup is with the Query Service installed as a RESTful microservice on Content Delivery. If you must install the Query Service to an existing legacy, in-process environment, refer to the Tridion Sites 9.1 legacy documentation.