To add an index, type a name for it into the "Index Name" field. Select which of the possible information sources to index by clicking the checkboxes beside them. The list shows all the assigned metadata elements, as well the full text. Having selected the data sources, choose the granularity of the index, using the "At the level" menu. Once these details are complete, "Add Index" becomes active (unless there is an existing index with the same settings). Click it to add the new index.

To remove an index, select it from the list of assigned indexes and click "Remove Index".

The default index, the one used on the collection's search page, is tagged with "[Default Index]" in the "Assigned Indexes" list. To set it, select an index from the list and click "Set Default". To reset it, click "Clear Index".

If advanced searching is enabled, the index controls are different. Each index is based on just one data source. There is a new data source "allfields" which is equivalent to entering a list of all the metadata elements. Levels are not assigned to a specific index, but apply across all indexes: thus indexes and levels are added separately. Indexes are removed in the same way as above, but the default index can no longer controls be set and cleared -- it is simply the first index assigned.