Elasticsearch - Attempted to send a bulk request but Elasticsearch appears to be unreachable or down


     My Elasticsearch is running properly but sometimes it shows this error .
  • Attempted to send a bulk request but there are no living connections in the pool (perhaps Elasticsearch is unreachable or down?) {:message=>"No Available connections", :exception=>LogStash::Outputs::Elasticsearch::HttpClient::Pool::NoConnectionAvailableError, :will_retry_in_seconds=>4}

.In elasticsearch some datas are not available i think because of this problem.when i'm checking the cluster health its been yellow and unassigned shards are 2.

anyone please give an advice or direction would be appreciated....

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