Made the reindex background task emit subtasks to support parallel reindex.
Made the reindex background task emit subtasks to support parallel reindex.

--HG--
extra : signature : gnupg%3AiF4EABEIAAYFAk9GLHUACgkQ/vhzUdYyylufwwD9EKtMcQW1DqmYZH3OMjDqHk3w9DxqTyMtofsjptYQxzkA/1P%2Beom2ynwpYVSFplgJTbHdD0wUrwi3mY8Or7XMKB2%2B

kostko/itsy