Filebeat Dynamic matching key field

[fengxiaoH (zelax)]

My configuration：

## The input config
filebeat.inputs:
- type: log
  enabled: true
  paths:
    - /data/logs_backup/baccarat/gate/gate.log
  fields:
    document_type: baccarat_gatelog
  fields_under_root: true

- type: log
  enabled: true
  paths:
    - /data/logs_backup/baccarat/room/room.log
  fields:
    document_type: baccarat_roomlog
  fields_under_root: true
## And Output config
#-------------------------- Redis output ------------------------------
output.redis:
    hosts: ["127.0.0.1"]
    port: 6379
    datatype: list
    keys:
      - key: "baccarat_gate"
        when.contains:
         document_type: "baccarat_gatelog"
      - key: "baccarat_room"
        when.contains:
          document_type: "baccarat_roomlog"

When i use 【keys】field，filebeat start failed。And when comment out the configuration for keys,filebeat start OK!
Can someone tell me what error for my config?Must need 【mappings】field？
Thanks!

[steffens (Steffen Siering)]

Please format config files and logs using the </> button in the editor window.

What is the actual error message you are seeing.