filebeat 6.4.3:
2018-11-07T21:46:19.653+0800 WARN elasticsearch/client.go:520 Cannot index event publisher.Event{Content:beat.Event{Timestamp:time.Time{wall:0xbef0d90aa48b4054, ext:10511332183032, loc:(*time.Location)(0x37d5800)}, Meta:common.MapStr(nil), Fields:common.MapStr{"metricset":common.MapStr{"rtt":7789, "name":"filesystem", "module":"system"}, "system":commo
n.MapStr{"filesystem":common.MapStr{"used":common.MapStr{"pct":0.0258, "bytes":0x1af00400000}, "available":0x3fa66f800000, "device_name":"172.27.128.100:6789:/k8s/devops/", "mount_point":"/mnt/cephfs/k8s/devops", "files":0xc7928, "type":"ceph", "total":0x41556fc00000, "free":0x3fa66f800000, "free_files":0xffffffffffffffff}}, "beat":common.MapStr{"name":"metricbe
at-128071-bin", "hostname":"m7-devops-128071", "version":"6.4.1"}, "host":common.MapStr{"name":"m7-devops-128071", "architecture":"x86_64", "os":common.MapStr{"family":"redhat", "codename":"Core", "platform":"centos", "version":"7 (Core)"}, "id":"61432cc588f747f4aec71029ea9e9408", "containerized":true}}, Private:interface {}(nil)}, Flags:0x0} (status=400): {"typ
e":"mapper_parsing_exception","reason":"failed to parse [system.filesystem.free_files]","caused_by":{"type":"i_o_exception","reason":"Numeric value (18446744073709551615) out of range of long (-9223372036854775808 - 9223372036854775807)\n at [Source: org.elasticsearch.common.bytes.BytesReference$MarkSupportingStreamInputWrapper@617a3e26; line: 1, column: 273]"}}