Select the wanted active running Search & Preview Servers
If the SharePoint farm has MORE active web front-ends, identified by having the “Microsoft SharePoint Foundation Web Application” service running, you will need to select the servers running Search & Preview to match it with your License Key File.
This is done in the Central Administration -> General Application Settings. In the Search & Preview section click Manage Search & Preview Licenses. Then click the active license and check the checkboxes for each active server running Search & Preview.
This configuration/setup is supported from in Search & Preview version 6.5 or later for 2010, 2013, 2016 or later
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