Vulnerability Discussion
Sending data to Apple to help improve search must be disabled.
The information system must be configured to provide only essential capabilities. Disabling the submission of search data will mitigate the risk of unwanted data being sent to Apple.
Check
Verify the macOS system is configured to disable sending search data from Spotlight with the following command:
/usr/bin/osascript -l JavaScript << EOS $.NSUserDefaults.alloc.initWithSuiteName('com.apple.assistant.support')\
.objectForKey('Search Queries Data Sharing Status').js
EOS
If the result is not "2", this is a finding.
Fix
Configure the macOS system to disable sending search data from Spotlight by installing the "com.apple.assistant.support" configuration profile.