Logstash error "there are no living connections in the connection pool"

Logstash instance is connected to an ES cluster behind a load balancer.
The load balancer has an idle timeout of 5 minutes.
Logstash is configured with the ES url corresponding to the loadbalancer ip.

There are random error messages as below -

[2020-06-18T01:10:05,698][WARN ][logstash.outputs.elasticsearch] UNEXPECTED POOL ERROR {:e=>#<LogStash::Outputs::ElasticSearch::HttpClient::Pool::NoConnectionAvailableError: No Available connections>}

[2020-06-18T01:10:05,699][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=>2}

Could someone please suggest fix for it --

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