Cirrus has some problems performing an in place reindex while changing the number of shards.

1. The size parameter sent to elasticsearch is based on the new shard count rather than the current shard count.
2. The size parameter is sent as a floating point number if the new shard count doesn't evenly divide 1000.

For ease of work it is probably simpler to fix the second problem first.

Version: unspecified
Severity: normal