You can restore a pod-based index by creating a new index from a collection.

Create a pod-based index from a collection

To create a pod-based index from a collection, use the create_index endpoint and provide a source_collection parameter containing the name of the collection from which you wish to create an index. The new index can differ from the original source index: the new index can have a different name, number of pods, or pod type. The new index is queryable and writable.