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Engine Name - this is the engine ID associated with your HawkSearch account.
API Key - it is used by the module to connect to HawkSearch Rest API.
Tracking Key - it is used to uniquely identify your account in the image pixel that is added to the order confirmation page on the site to track your customer interactions and orders data and generate reflect them in appropriate reports in Hawk SearchHawksearch reports. Please use this article that will help you find your Tracking Key.
In the administration section of your Magento project, navigate to Stores > Configuration > HAWKSEARCH > Connection Settings and fill in the form with all the information required.
Specify Run Mode setting depending on the site environment. Read more in Domains and Environments documentation section
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Read in details about the indexing process.