To change the name or description of a data source, select the pencil icon below the data source name:
In the Update data source modal, enter the new name or description and choose Update.
Select the Indexing Configurations option. In the pop-out menu that appears, enter the new settings and choose Update Indexing Configurations.
The changes will apply to new content that is added and indexed.
To change the indexing configuration settings for existing content, create a new knowledge base and new data source using the new settings, add the files, and index.
Definitions of these settings and how to use them are provided in the article Setting Up and Using Your Knowledge Base.