Elasticsearch Restore Problem

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][1] marking and sending shard failed due to [failed recovery]

Elasticsearch 7.10 is EOL and no longer supported. Please upgrade ASAP.

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