Represents a descriptor for the object that is about to be indexed. It stores a reference to the object itself as well as an already set up SerializedObject.
| documentIndex | Document Index which owns the object to index. |
| id | Object Id. The object path for an asset or the GlobalObjectId for a scene object. |
| serializedObject | Serialized representation of the object to be indexed. |
| target | Object to index. |
| targetType | Object type to index. |