How can Splunk's 'search job' be modified?

The ability to modify a Splunk 'search job' primarily revolves around adjusting specific parameters and filters associated with the search. This includes changing the search time range to specify the time window for the data being queried, setting limits on the number of results returned, and applying additional filters to refine the search outcome. These adjustments directly influence the data returned and the performance of the search job.

The other choices either don't relate directly to modifying a search job or represent functions that are more about user management or data ingestion rather than search query customization. Changing user interface settings can affect how users interact with the search results but does not alter the underlying search job itself. Similarly, creating new user roles pertains to access permissions within Splunk rather than adjustments to a specific search execution. Lastly, adding more data sources expands the volume of data that can be searched but does not modify the details of a pre-existing search job.