Media Type Facet
We are using Coveo for Sitecore and with the basic installation I do not see the Media Type as a Facet. We will be using both it for Intranet (using Sitecore) and for external sources. How would we configure this? Is it a special field name that we would use?
I'm unsure what you mean by Media Type… on a Media Library item, you could have either Mime Type (such as image/png) or Extension (png). I would go with Mime Type. To configure this field as a facet, you should add it in your fieldMap in the Coveo.SearchProvider.config file, with the name media type, and setting the attribute isFacet="true"
See the reference here : Using the Sitecore Search Provider
For external sources, this is a bit different. It will depend on which build of Coveo for Sitecore you are. Currently, you would need to add the field manually on the external sources by the Coveo Admin Tool. Field names in Coveo are formatted like this : @mediaz95xtype12345, where 12345 is a hash of the source name.
You would need to add 3 fields on your external source, one for each database (web, master and core).
Starting from September, you will be able to simply add an attribute in your field called isExternal="true", and then you will be able to use the same name as the field on the external source.