I have indexes that are created weekly, associated to an allias. The indexes were configured for two shards, and one replica per shard. The shards are very low space, around 50 mb, so I think those could be converted to one shard, to have more shards free and not exceed the recommended shard per RAM limit. For this I am using the api forcemerge, to join several indexes in a single shard. Even so, after performing the forcemerge, I still get the indexes in two shards. How can I join in a single shard the indexes that I select?