I wish I could share more error. Unfortunately I dont have much error log. I have below in logstash plain log in debug mode
[2021-05-05T18:16:49,820][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:16:54,382][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:17:14,393][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:17:18,594][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:17:19,395][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:17:19,395][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:17:24,398][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:17:24,398][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:17:29,401][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:17:29,401][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:17:34,404][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:17:46,200][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:17:49,412][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:17:49,412][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:17:51,008][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:17:53,821][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:17:54,415][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:17:54,415][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:19,427][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:19,428][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:22,597][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:18:24,430][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:24,431][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:29,433][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:29,434][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:34,436][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:34,436][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:39,439][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:39,439][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:44,441][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:44,441][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:49,444][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:49,444][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:50,202][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:18:54,447][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:54,447][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:18:55,009][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:18:57,823][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:18:59,450][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:18:59,450][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:04,453][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:04,453][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:09,456][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:09,456][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:14,458][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:14,459][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:19,462][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:19,462][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:24,464][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:24,464][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:26,599][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:19:29,466][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:29,466][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:34,469][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:34,469][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:39,471][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:39,471][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:44,474][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:44,474][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:49,477][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:49,477][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:54,205][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:19:54,481][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2021-05-05T18:19:54,481][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2021-05-05T18:19:59,011][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}
[2021-05-05T18:20:01,823][ERROR][logstash.outputs.elasticsearch][events] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://localhost:9200/_bulk", :body=>"{\"error\":{\"root_cause\":[{\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"}],\"type\":\"action_request_validation_exception\",\"reason\":\"Validation Failed: 1: id is missing;\"},\"status\":400}"}