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

Elastic Stack Logstash
1

Hi Team,

We are using the ELK stack and we are getting the below error in our logstash pods logs .
Logs are sending slowly or some time it is not at all processing the logs .

Note: We checked the elasatic search service local host and it is up and running all the time though the error was captured.

Version we used in our platform:
Elasticsearch - Elasticsearch:7.4.2
Logstash - logstash:6.8.22
kibana - kibana:7.4.2

Elasticsearch-cluster-data 17 nodes
Elasticsearch-cluster-master 3 nodes

Error Message in logstash:
[ERROR] 2022-01-12 14:49:02.747 [[main]>worker0] Elasticsearch - Attempted to send a bulk request to Elasticsearch' but Elasticsearch appears to be unreachable or down! {:error_message=>"Elasticsearch Unreachable: [http://es.elastic:9200/][Manticore::SocketTimeout] Read timed out", :class=>"LogStash::Outputs::Elasticsearch::HttpClient::Pool::HostUnreachableError", :will_retry_in_seconds=>8}

[WARN ] 2022-01-12 14:49:05.562 [Ruby-0-Thread-4: /usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-Elasticsearch-9.4.0-java/lib/logstash/outputs/Elasticsearch/http_client/pool.rb:232] Elasticsearch - Restored connection to ES instance {:url=>"http://es.elastic:9200/"

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