Elasticsearch Unreachable Error

We have observed a log message

[ERROR][logstash.outputs.elasticsearch][.monitoring-logstash] Attempted to send a bulk request to elasticsearch' but Elasticsearch appears to be unreachable or down! {:error_message=>"Elasticsearch Unreachable: [<elastic_search_link>][Manticore::ClientProtocolException] <elastic_search_link> failed to respond", :class=>"LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError", :will_retry_in_seconds=>2}

Despite the elasticsearch being up and running and we are able to hit the elasticsearch and get response in Kibana.

Not sure on what is causing this error.
Please guide.

Would you please verify it via curl and post the response? Change the address to your Logstash target address.

curl -XGET http://localhost:9200

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