We have an ES cluster - started with 3 machines and we recently added 2 more. We are processing user aggregation data. We had an index called users-v6 and when we added the new machines it distributed across them. We wanted to rerun the aggregations so we wrote to a new index - users-v7.
The interesting part is that the v7 is only running on the initial machines and is not putting shards/replicas on the the other nodes.
Any ideas why and how I can fix this?