Ping exception after elastic search restart

Can some one let me know why below exception comes after restart

System.Exception: ping returned no status code
Inner exception: System.Net.WebException: The operation has timed out
*** Exception to reporting point stack trace ***
at System.Net.HttpWebRequest.GetResponse()
at
Elasticsearch.Net.Connection.HttpConnection.DoSynchronousRequest(HttpWebRequest
request, Byte[] data, IRequestConfiguration requestSpecificConfig)
*** Reporting point to the top stack trace ***

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