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logstash에서 elasticsearch로 index 시에 아래와 같은 에러가 발생 되었다. [2020-07-28T15:01:08,012][WARN ][logstash.outputs.elasticsearch] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"spring-logback-2020.07.28", :_type=>"_doc", :routing=>nil}, #], :response=>{"index"=>{"_index"=>"spring-logback-2020.07.28", "_type"=>"_doc", "_id"=>nil, "status"=>400, "error"=>{"typ..