SharePoint 2013 allows you to setup an Enterprise Search document in file share. These steps will guide you how to configure SharePoint 2013 to Shared Folder.
The following steps will guide you how to configure SharePoint 2013 to Shared Folder. Step 1: Go to Central Administration, Service Application, then Manage Service Application. Step 2: Click Search Service Application. Step 3: Click Content Source. Step 4: Click New Content Source on top of the link bar. Step 5: Use this page to Add, Edit or Delete Content Source and to Manage Crawls. Click New Content Source. Content Source Type Select what type of Content will be crawls. Note: This cannot be changed after this content source is created because other settings depend on it. Start Addresses Type the URL from which the search system should start crawling. Step 6: Click OK to perform a full crawl of this content source.
SharePoint Online And Office 365 Administration