Remove Sensitive Items from Search Results
Discovery Search includes an easy method for end-users to hide items that should not be displayed within search results.
When this feature is enabled, users may report documents that should not be displayed by clicking the Report Document button in the document preview pane.

When the Report Document button is clicked, the user is prompted to record why this record should be hidden from view:

If you select "Other", a prompt will require a short description of why the record should be hidden from view.
2. Once submitted, the document is immediately hidden from all future search results.
To turn this feature on:
Edit Discovery Server’s Web.config file. Update the following key by setting the value=”true”
CODE<add key="ReportedItemFilterEnabled" value="true" />
Save
Restart (Stop and Start) Discovery Server in IIS
To disable feature and remove the flags from search results, the ReportedItemFilterEnabled key must be set to “false”.