Error reallocate UNASSIGNED shard

Elastic Stack Elasticsearch
1

Hello! )

I have one UNASSIGNED schard.
I'm trying to do manually reallocate,

but get:

{
  "error" : {
    "root_cause" : [ {
      "type" : "json_parse_exception",
      "reason" : "Unexpected character ('}' (code 125)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field name\n at [Source: org.elasticsearch.transport.netty.ChannelBufferStreamInput@7442e83a; line: 8, column: 12]"
    } ],
    "type" : "json_parse_exception",
    "reason" : "Unexpected character ('}' (code 125)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field name\n at [Source: org.elasticsearch.transport.netty.ChannelBufferStreamInput@7442e83a; line: 8, column: 12]"
  },
  "status" : 500
}

I do not know where the error is.

How can I fix it?
Thank you.