The code committed SERVER-72283 is performing a query on config.chunks extracting chunks on fields <uuid, shard, forceJumbo, onCurrentShardSince> and ordering the result by min.

Aim of this ticket is to investigate whether to:

• Simply keep the existing index on <uuid, shard, min>
  OR
• Remove the index existing index and create a new one with more fields: <uuid, shard, min, onCurrentShardSince, jumbo>

Additionally, a new index will be added for the initial query performed by the auto-merger to identify <shards, nss> tuples for which it is possible to issue auto-merge requests.