Require suggestion for the logstash processing : Logstash

This error occured when i use logstash to collect logs and output it to Elastic Search.
i use logstash on my linux server and logstash version is 6.4.2.Input file size is 40 gb and data is unstructure

following my logstash log:

[logstash.outputs.elasticsearch] Encountered a retryable error. Will Retry with exponential backoff {:code=>503, :url=>"http://localhost:9200/_bulk"}

how can i solve this problem,and what caused this ?

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