I have a Cluster running in Elasticsearch 7.10.2 version. I have added a new server to this Cluster. I use it with Graylog. I get the following Log while restoring the index without a replica. and it falls into the Cluster RED state. it does not distribute shards to the server that has just been added to the Cluster.
[o.e.i.c.IndicesClusterStateService] [node-5] [restore_1212218071] marking and sending shard failed due to [failed recovery]