按日期对ES的index进行分割:

logstash配置:

input{
  file{
    path => "/home/hottopic/logs/trend-shotting-api/metric/*"
    type => "trend-shotting-api-metric"
    start_position => "beginning"
    codec => json {
            charset => "UTF-8"
        }
  }
}

output{
  if [type] == "trend-shotting-api-metric" {
    elasticsearch {
    hosts=> ["172.17.213.60:9200"]
    index=> "trend-shotting-api-metrick.%{+YYYY-MM}"
    }
  }
}

grafana源配置：(注意日期格式要统一，比如YYYY-MM或YYYY.MM)

---

配置Groub by -Terms时报错，提示需要设置fielddata=true，报错内容大概如下： 

"Fielddata is disabled on text fields by default ... "

解决方法如下：

https://www.elastic.co/guide/en/elasticsearch/reference/current/fielddata.html#\_fielddata\_is\_disabled\_on\_literal\_text\_literal\_fields\_by\_default

curl -X PUT "localhost:9200/nginx/_mapping/doc" -H 'Content-Type: application/json' -d'
{
  "properties": {
    "xforward": { 
      "type":     "text",
      "fielddata": true
    }
  }
}
'

操作后仍然报错，于是

curl -X PUT "localhost:9200/nginx/_mapping/doc?update_all_types" -H 'Content-Type: application/json' -d'         
{
  "properties": {
    "xforward": { 
      "type":     "text",
      "fielddata": true
    }
  }
}
'

以上nginx为index名称  xforward为字段名称。

修改完后查看结果显示已修改成功

 返回到Grafana进行再一次设置

修改成功后，可以正常出图。