Get index on-disk version.
Valid return values are 2, 3, or 4. If 3 is returned, an index with version 2 may be written instead, if the extension data in version 3 is not necessary.
@param index An existing index object @return the index version
See Implementation
Get index on-disk version.
Valid return values are 2, 3, or 4. If 3 is returned, an index with version 2 may be written instead, if the extension data in version 3 is not necessary.
@param index An existing index object @return the index version