Function cuvsTieredIndexMerge 

pub unsafe extern "C" fn cuvsTieredIndexMerge(
    res: cuvsResources_t,
    index_params: cuvsTieredIndexParams_t,
    indices: *mut cuvsTieredIndex_t,
    num_indices: usize,
    output_index: cuvsTieredIndex_t,
) -> cuvsError_t