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The metricbeat golang module is emitting mapping exceptions:

mapper [golang.filebeat.memstats.BySize.Frees] cannot be changed from type [float] to [long]

For confirmed bugs, please report:

• Version: master (2020-06-25)
• Operating System: MacOS connected to Filebeat running on Windows built with Go 1.13
• Discuss Forum URL:
• Steps to Reproduce:

2020-06-25T18:45:19.374-0400 WARN [elasticsearch] elasticsearch/client.go:407 Cannot index event publisher.Event{Content:beat.Event{Timestamp:time.Time{wall:0xbfb5681f9338ce90, ext:57865987, loc:(*time.Location)(0x83d8900)}, Meta:null, Fields:{"agent":{"ephemeral_id":"600ded17-b8ad-45af-b5ff-422beb7461e0","id":"7fccf1c5-aa19-48b1-a01f-54e761603dc1","name":"mac15","type":"metricbeat","version":"8.0.0"},"ecs":{"version":"1.5.0"},"event":{"dataset":"golang.filebeat","duration":3125846,"module":"golang"},"golang":{"filebeat":{"beat.cpu.system.ticks":133656.000000,"beat.cpu.system.time.ms":133656.000000,"beat.cpu.total.ticks":274781.000000,"beat.cpu.total.time.ms":274781.000000,"beat.cpu.total.value":274781.000000,"beat.cpu.user.ticks":141125.000000,"beat.cpu.user.time.ms":141125.000000,"beat.handles.open":402.000000,"beat.info.ephemeral_id":"d6ffd055-7bfc-4e9f-aecc-dd2ef6b9cd4a","beat.info.uptime.ms":1268257.000000,"beat.memstats.gc_next":46626464.000000,"beat.memstats.memory_alloc":39269104.000000,"beat.memstats.memory_total":25175470512.000000,"beat.memstats.rss":80547840.000000,"beat.runtime.goroutines":165.000000,"cmdline":"C:\\Gopath\\src\\github.com\\elastic\\beats\\filebeat\\filebeat.exe -e --httpprof 0.0.0.0:6060 -c .\\filebeat.tcp.yml","filebeat.events.active":4257.000000,"filebeat.events.added":2234616.000000,"filebeat.events.done":2230359.000000,"filebeat.harvester.closed":0.000000,"filebeat.harvester.open_files":0.000000,"filebeat.harvester.running":0.000000,"filebeat.harvester.skipped":0.000000,"filebeat.harvester.started":0.000000,"filebeat.input.log.files.renamed":0.000000,"filebeat.input.log.files.truncated":0.000000,"libbeat.config.module.running":0.000000,"libbeat.config.module.starts":0.000000,"libbeat.config.module.stops":0.000000,"libbeat.config.reloads":0.000000,"libbeat.config.scans":0.000000,"libbeat.output.events.acked":2230359.000000,"libbeat.output.events.active":2048.000000,"libbeat.output.events.batches":1211.000000,"libbeat.output.events.dropped":0.000000,"libbeat.output.events.duplicates":0.000000,"libbeat.output.events.failed":0.000000,"libbeat.output.events.toomany":0.000000,"libbeat.output.events.total":2232407.000000,"libbeat.output.read.bytes":0.000000,"libbeat.output.read.errors":0.000000,"libbeat.output.type":"console","libbeat.output.write.bytes":930264450.000000,"libbeat.output.write.errors":0.000000,"libbeat.pipeline.clients":1.000000,"libbeat.pipeline.events.active":4117.000000,"libbeat.pipeline.events.dropped":0.000000,"libbeat.pipeline.events.failed":0.000000,"libbeat.pipeline.events.filtered":0.000000,"libbeat.pipeline.events.published":2234475.000000,"libbeat.pipeline.events.retry":0.000000,"libbeat.pipeline.events.total":2234476.000000,"libbeat.pipeline.queue.acked":2230359.000000,"memstats":{"Alloc":39354592.000000,"BuckHashSys":1479026.000000,"BySize":[{"Frees":0.000000,"Mallocs":0.000000,"Size":0.000000},{"Frees":2236416.000000,"Mallocs":2239952.000000,"Size":8.000000},{"Frees":15653283.000000,"Mallocs":15684874.000000,"Size":16.000000},{"Frees":2250546.000000,"Mallocs":2259889.000000,"Size":32.000000},{"Frees":13396167.000000,"Mallocs":13426476.000000,"Size":48.000000},{"Frees":2237944.000000,"Mallocs":2243115.000000,"Size":64.000000},{"Frees":3679.000000,"Mallocs":3766.000000,"Size":80.000000},{"Frees":11172004.000000,"Mallocs":11183302.000000,"Size":96.000000},{"Frees":7562.000000,"Mallocs":7739.000000,"Size":112.000000},{"Frees":2859.000000,"Mallocs":2965.000000,"Size":128.000000},{"Frees":762.000000,"Mallocs":784.000000,"Size":144.000000},{"Frees":438.000000,"Mallocs":671.000000,"Size":160.000000},{"Frees":75.000000,"Mallocs":133.000000,"Size":176.000000},{"Frees":32.000000,"Mallocs":50.000000,"Size":192.000000},{"Frees":1027.000000,"Mallocs":1202.000000,"Size":208.000000},{"Frees":405.000000,"Mallocs":419.000000,"Size":224.000000},{"Frees":1261.000000,"Mallocs":1306.000000,"Size":240.000000},{"Frees":1063.000000,"Mallocs":1163.000000,"Size":256.000000},{"Frees":13385962.000000,"Mallocs":13411777.000000,"Size":288.000000},{"Frees":471.000000,"Mallocs":589.000000,"Size":320.000000},{"Frees":372.000000,"Mallocs":445.000000,"Size":352.000000},{"Frees":33.000000,"Mallocs":324.000000,"Size":384.000000},{"Frees":130.000000,"Mallocs":148.000000,"Size":416.000000},{"Frees":10.000000,"Mallocs":33.000000,"Size":448.000000},{"Frees":10.000000,"Mallocs":16.000000,"Size":480.000000},{"Frees":4764.000000,"Mallocs":4793.000000,"Size":512.000000},{"Frees":376.000000,"Mallocs":446.000000,"Size":576.000000},{"Frees":199.000000,"Mallocs":1182.000000,"Size":640.000000},{"Frees":26.000000,"Mallocs":38.000000,"Size":704.000000},{"Frees":22.000000,"Mallocs":30.000000,"Size":768.000000},{"Frees":113.000000,"Mallocs":155.000000,"Size":896.000000},{"Frees":898.000000,"Mallocs":1064.000000,"Size":1024.000000},{"Frees":77.000000,"Mallocs":122.000000,"Size":1152.000000},{"Frees":131.000000,"Mallocs":182.000000,"Size":1280.000000},{"Frees":27.000000,"Mallocs":38.000000,"Size":1408.000000},{"Frees":40.000000,"Mallocs":64.000000,"Size":1536.000000},{"Frees":104.000000,"Mallocs":134.000000,"Size":1792.000000},{"Frees":114464.000000,"Mallocs":114570.000000,"Size":2048.000000},{"Frees":48.000000,"Mallocs":116.000000,"Size":2304.000000},{"Frees":134.000000,"Mallocs":207.000000,"Size":2688.000000},{"Frees":9.000000,"Mallocs":37.000000,"Size":3072.000000},{"Frees":6.000000,"Mallocs":10.000000,"Size":3200.000000},{"Frees":7.000000,"Mallocs":10.000000,"Size":3456.000000},{"Frees":116115.000000,"Mallocs":116359.000000,"Size":4096.000000},{"Frees":101.000000,"Mallocs":116.000000,"Size":4864.000000},{"Frees":114301.000000,"Mallocs":114379.000000,"Size":5376.000000},{"Frees":120.000000,"Mallocs":125.000000,"Size":6144.000000},{"Frees":7.000000,"Mallocs":9.000000,"Size":6528.000000},{"Frees":114274.000000,"Mallocs":114341.000000,"Size":6784.000000},{"Frees":1.000000,"Mallocs":1.000000,"Size":6912.000000},{"Frees":25.000000,"Mallocs":31.000000,"Size":8192.000000},{"Frees":114605.000000,"Mallocs":114677.000000,"Size":9472.000000},{"Frees":13.000000,"Mallocs":13.000000,"Size":9728.000000},{"Frees":9.000000,"Mallocs":10.000000,"Size":10240.000000},{"Frees":26.000000,"Mallocs":30.000000,"Size":10880.000000},{"Frees":11334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Private:interface {}(nil), TimeSeries:true}, Flags:0x0, Cache:publisher.EventCache{m:common.MapStr(nil)}} (status=400): {"type":"illegal_argument_exception","reason":"mapper [golang.filebeat.memstats.BySize.Frees] cannot be changed from type [float] to [long]"}

Pinging @elastic/integrations (Team:Integrations)

The expvar metricset does not have a mapping. Plus it allows for a custom namespace (golang.filebeat in my case) so mapping those fields is even more of a challenge.

- module: golang
  metricsets:
    - expvar
    - heap
  period: 10s
  hosts: ["192.168.135.50:6060"]
  heap.path: "/debug/vars"
  expvar:
    namespace: "filebeat"
    path: "/debug/vars"

awkward to +1 this since it's not awesome, but I just ran into this too mapper [golang.apm-server.memstats.BySize.Frees] cannot be changed from type [float] to [long]

FWIW - this is still an issue. I am running the Stack version 7.10 in CentOS Docker containers. I get the following error when trying to index metrics using the Metricbeat golang module OOTB:

"host":{"architecture":"x86_64","containerized":true,"hostname":"checkoutservice","ip":["172.19.0.18"],"mac":["02:42:ac:13:00:12"],"name":"checkoutservice","os":{"codename":"Core","family":"redhat","kernel":"4.9.184-linuxkit","name":"CentOS Linux","platform":"centos","version":"7 (Core)"}},"metricset":{"name":"expvar","period":10000},"service":{"address":"http://localhost:6060/debug/vars","type":"golang"}}, Private:interface {}(nil), TimeSeries:true}, Flags:0x0, Cache:publisher.EventCache{m:common.MapStr(nil)}} (status=400): {"type":"illegal_argument_exception","reason":"mapper [golang.example.memstats.PauseEnd] cannot be changed from type [long] to [float]"}

Met same issue with docker.elastic.co/beats/metricbeat:7.12.0.

{"type":"illegal_argument_exception","reason":"mapper [golang.example.memstats.BySize.Frees] cannot be changed from type [float] to [long]"}

same here

(status=400): {"type":"illegal_argument_exception","reason":"mapper [golang.expvar.memstats.PauseEnd] cannot be changed from type [long] to [float]"}

I had faced it before in my apps. Our solution was to add .0 to the floats without a decimal point when we were generating JSON

I've now seen this happen in Filebeat as well. Documents come in as floats, then later some come in looking like "5" or "12". These should really be converted to floats. No need to fail or require the user to sanitise manually.

Hi! We just realized that we haven't looked into this issue in a while. We're sorry!

We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!

So, any update on this?

Met same issue as @mdaliyan with 8.8.2 mapper [golang.expvar.memstats.PauseEnd] cannot be changed from type [float] to [long]\"}, dropping event!

Hi! We just realized that we haven't looked into this issue in a while. We're sorry!

We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!