SharePoint Server
A family of Microsoft on-premises document management and storage systems.
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Reference website: https://video2.skills-academy.com/en-us/sharepoint/dev/general-development/sharepoint-search-rest-api-overview
PersonalizationData
The GUID for the user who submitted the search query.
You could use rest api to get SPUser guid in SharePoint: /_api/web/SiteUserInfoList/Items/
As the below picture shows: