Logstash - UNEXPECTED POOL ERROR

Elastic Stack Logstash
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[2018-02-26T16:28:52,669][WARN ][logstash.outputs.elasticsearch] UNEXPECTED POOL ERROR {:e=>#<LogStash::Outputs::ElasticSearch::HttpClient::Pool::NoConnectionAvailableError: No Available connections>}
[2018-02-26T16:28:52,669][ERROR][logstash.outputs.elasticsearch] Attempted to send a bulk request to elasticsearch, but no there are no living connections in the connection pool. Perhaps Elasticsearch is unreachable or down? {:error_message=>"No Available connections", :class=>"LogStash::Outputs::ElasticSearch::HttpClient::Pool::NoConnectionAvailableError", :will_retry_in_seconds=>8}

But I can get to elasticsearch port:

telnet our-elk-server 9200
Trying 10.240.1.4...
Connected to our-elk-server.
Escape character is '^]'.
^]
telnet> Connection closed.
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All the configuration files are here:

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