The configuration file SearchSource.config informs InSite Search (ISS) as to what is searchable in the DSS. Do not customize the SearchSource.config file directly, as each publish operation rewrites this file on disk.
Viewing and Editing SearchSource.config
You can view your SearchSource.config file in the Settings folder of your publishing target (e.g., [Drive]:\[path-to-DSS-root-directory]\[path-to-published-content-directory]\settings\SearchSource.config).
Strictly speaking, you are not required to edit this file in order for searches to return. Keep in mind that you must indicate the locations of all indexing sources within the Search.config file, including the settings file, SearchSource.config. The Search.config file identifies SearchSource.config by its library type (i.e., Ingeniux.Runtime.DssContentSearchSource).
See Configuring Search.config for details about how to set indexing sources in Search.config.If you need to add customizations to SearchSource.config , navigate to to import or export file configurations.