Filebeat - Logstash connection reset by peer

2018-09-25T14:21:41.821+0800 ERROR logstash/async.go:252 Failed to publish events caused by: write tcp 127.0.0.1:45718->127.0.0.1:5044: write: connection reset by peer
2018-09-25T14:21:42.821+0800 ERROR pipeline/output.go:109 Failed to publish events: write tcp 127.0.0.1:45718->127.0.0.1:5044: write: connection reset by peer

filebeat往logstash写日志，偶尔会报这个错，但是写入正常，需要继续跟踪问题

1）当filebeat从log里读取写到logstash时候不会报错
2）用postman提交日志，往*.log里写入时候，filebeat会读取然后向logstash写，这个时候会偶尔报错

查询有说是logstash那边配置，比如grok的问题…待验证