Final answer:
To prompt the Splunk Deployment Server to rescan without restarting, use the 'splunk _internal call /services/deployment/server/config/_reload' command in the Splunk CLI. Refreshing the Splunk web interface or modifying the configuration file without a reload command will not suffice.
Step-by-step explanation:
To instruct the Deployment Server (DS) to rescan for changes without restarting Splunk, you can use the debug refresh command. This is executed from the Splunk CLI. By running the command splunk _internal call /services/deployment/server/config/_reload, you can trigger the Deployment Server to rescan the deployment-apps directory for changes and apply any necessary updates to deployment clients. Modifying the configuration file alone will not cause an immediate rescan without a reload command or service restart. It is not sufficient to refresh the Splunk web interface.
It's important to note that the 'rescan' command is not a recognized command in Splunk's CLI, and restarting the Splunk service (though it will cause a rescan to happen) is not an efficient way to prompt a rescan for changes if you are seeking to avoid a full restart of the Splunk instance.