Encountered a retryable error. Will Retry with exponential backoff {:code=>400, :url=>"http://elasticsearch.topesc:9200/_bulk"}

logstash.config

input {
  udp {
    port => 55144
    type => "log"
  }
}
output {
  stdout { codec => rubydebug }

  elasticsearch {
        hosts => ["******"]
        index => "alarm"
        document_type => "udp"
        manage_template => true
        template => "/etc/template/logstash_***.json"
        template_name => "***_template"
        template_overwrite => true
    } 
}

Codec => ruby ​​debug

can output log data, but logstash.outputs.elasticsearch reports an error with

[ERROR][logstash.outputs.elasticsearch] Encountered a retryable error. Will Retry with exponential backoff {:code=>400, : Url=>"http://******:9200/_bulk"}

Elasticsearch does not have any log output

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