The current implementation creates a name option that does not follow the convention. The auto generated name for an index should follow the convention FIELD0_DIRECTION0_FIELD1_DIRECTION1_... where FIELD0, FIELD1, etc. are field names and DIRECTION0, DIRECTION1, etc. are corresponding directions, either 1 or -1.

If you don't specify the name option, the driver should create the name from the key following the convention.