Filebeat-7.6.0 自定义索引启动后 日志中报错

Filebeat-7.6.0问题：
--使用默认模板创建索引时，正常
--使用自定义模板创建索引时，启动filebeat后，报错如下：
ERROR pipeline/output.go:121 Failed to publish events: temporary bulk send failure
暂时没有找到解决办法。（官网和github上没有找到有效的解决办法）
 
附自定义索引配置文件：

filebeat.inputs:

- type: log

  enabled: true

  paths:

    - /data/logs/ptomweb/*.log

  fields:

    source: ptomweblog

  fields_under_root: true

  tail_files: true



    

#filebeat.config.modules:

#  path: ${path.config}/modules.d/*.yml

#  reload.enabled: true



setup.template.settings:

  index.number_of_shards: 1  



setup.template.name: "java"

setup.template.pattern: "java-*"

setup.template.overwrite: true

setup.template.enabled: true

setup.ilm.enabled: false





output.elasticsearch:

  hosts: ["http://192.168.0.xx:9200"]

  username: "elastic"

  password: "xxx"

  index: "java-%{[fields.source]}-*"

  indices:

    - index: "java-ptomweblog-%{+yyyy.MM.dd}"

      when.equals:

        fields.source: "ptomweblog"



setup.kibana:

  host: "192.168.0.xx:5601"

  username: "elastic" 

  password: "xxxx"



processors:

 - drop_fields:

     fields: ["agent.ephemeral_id", "agent.hostname", "agent.id",  "agent.version", "ecs.version", "log.offset", "agent.type", "input.type"]

     ignore_missing: true