In the view "Edit indexes" existing indexes will be managed or new indexes will be added.
When creating a new index the only required field is the "key" field. All other inputs are optional and can be reached via the "Advanced settings" item. For more detailed information about the settings for the indexes the info icons beside the field labels can used. A detailed documentation can be found here: http://docs.mongodb.org/manual/core/indexes-introduction/
Geospital-indexes are not currently supported.