A Search environment designates a set of one or more machines as being responsible for one of the following tasks:
Indexing your content. Each Search project has a single environment for indexing, which can be distributed across multiple hosts.
Answering end-user queries using the deployed index. A project can have any number of environments for this purpose. These environments should be hosted on a machine optimized for high availability and performance.
Before you run Search tests, you must identify the Search environments that contain the products, SKUs, search configurations, facets, and other search settings you want to test.