Data sources include several advanced configuration properties by default: you do not need to implement these properties as Java fields in an PipelineComponentConfiguration class. An application developer can set these properties using the CAS Server Command-line Utility, the CAS Server API, and in the CAS Console (on the Advanced Settings tab). The log level setting applies to high-level aspects of a data acquisition, such as logging crawl history, but the log level setting does not apply to the data source extension itself.