logstash同步日志信息到es失败

logstash版本6.3.2 .在正常同步日志到es中，并按月自动创建索引，遇到同步一批数据过程中遇见[logstash.outputs.elasticsearch] Marking url as dead. Last error: [LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError] 这样的错误，但是此时去curl 127.0.0.1：9200发现是正常的；然后日志反复的打印[logstash.outputs.elasticsearch] Attempted to send a bulk request to elasticsearch, but no there are no living connections in the connection pool. Perhaps Elasticsearch is unreachable or down?这样的错误，导致新的日志也不会同步到es中了