Best practice: specify the Local SharePoint results source ID to gain search control
When creating solutions based on SharePoint search, you best always define the source ID of the Local SharePoint results source with each call. By providing that source ID with each request, you make sure that the results you expect for your solutions are always the same. Which ID? The Local SharePoint results source ID you are looking for is: 8413cd39-2156-4e00-b54d-11efd9abdb89. How? The “how” depends