Few unassigned shards

hi Everyone,

I upgraded my last node but due to some issue 36 shards left unassigned. and its not getting assigned because of below issue:
"can_allocate" : "no_valid_shard_copy",
"allocate_explanation" : "cannot allocate because a previous copy of the primary shard existed but can no longer be found on the nodes in the cluster",

Please help me asap . Now only master node is left to upgrade

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