To search the contents of files in Commvault search environments such as Compliance Search, you must content index the files.
With basic indexing, you can search on the attributes of an item, such as file name, file type, and modified time. By default, the site contents are not indexed. This level of indexing is achieved by running a backup job not a content indexing job.
Advanced Content Indexing
With advanced content indexing, you can do the following:
Search on the contents of files.
Search on the attributes of an item, such as file name, file type, and modified time.
For information on running a content indexing job, see Running a SharePoint Online Content Indexing Job.