filebeat 配置fields字段，logstash接收不到

https://elasticsearch.cn/question/3409   在这个问题中找到了同样的困境，但是并没有从文章中得到解决方案。。
 
首先我是filebeat->logstash->es 这样的流程架构，fb是和logstash都是6.3的。
 
filebeat配置如下：

#=========================== Filebeat inputs =============================



filebeat.inputs:



# Each - is an input. Most options can be set at the input level, so

# you can use different inputs for various configurations.

# Below are the input specific configurations.



- type: log



  # Change to true to enable this input configuration.

  enabled: true



  # Paths that should be crawled and fetched. Glob based paths.

  paths:

    - /opt/flogs/*.log

    - /opt/log/orderlog/*.log

    #- c:\programdata\elasticsearch\logs\*

  fields:

      cluster: orderlog



  # Exclude lines. A list of regular expressions to match. It drops the lines that are

  # matching any regular expression from the list.

  #exclude_lines: ['^DBG']



  # Include lines. A list of regular expressions to match. It exports the lines that are

  # matching any regular expression from the list.

  #include_lines: ['^ERR', '^WARN']



  # Exclude files. A list of regular expressions to match. Filebeat drops the files that

  # are matching any regular expression from the list. By default, no files are dropped.

  #exclude_files: ['.gz$']



  # Optional additional fields. These fields can be freely picked

  # to add additional information to the crawled log files for filtering

  #fields:

  #  level: debug

  #  review: 1



  ### Multiline options



  # Mutiline can be used for log messages spanning multiple lines. This is common

  # for Java Stack Traces or C-Line Continuation



  # The regexp Pattern that has to be matched. The example pattern matches all lines starting with [

  #multiline.pattern: ^\[



  # Defines if the pattern set under pattern should be negated or not. Default is false.

  #multiline.negate: false



  # Match can be set to "after" or "before". It is used to define if lines should be append to a pattern

  # that was (not) matched before or after or as long as a pattern is not matched based on negate.

  # Note: After is the equivalent to previous and before is the equivalent to to next in Logstash

  #multilinie.match: after

  multiline.pattern: '^\['



  multiline.negate: true



  multiline.match: after

截取inputs这部分。我已经配置了fileds，设置了k-v
 
然后看logstash，我是是这么处理的:

input {

  beats {

    port => 5044

  }

}



output {

    elasticsearch {

        hosts => "http://xxxxx:xx"

        manage_template => true

        index => "mylog-%{fields}%{cluster}%{+YYYY.MM.dd}"

        template_name => "tmp_mylog"

    }

}

结果索引名变成了：mylog-%{fields}%{cluster}2018.08.07  很明显这俩变量没生效,并没有变成mylog-orderlog20180807这样的格式， 换成了
[fields][cluster] 一样没用 和上面的名字一样。不懂为何不生效，求解