@timestamp上的elasticsearch排序索引无法正常工作

Question

我不明白为什么它不起作用。我试图按sort.field对索引进行排序：＆＃34; @ timestamp＆＃34;并且它说＆＃34;未知索引排序字段：[@ timestamp]。

我也尝试过使用＆＃34; timestamp＆＃34;和另一个类型＆＃34; date＆＃34;但仍然没有成功。使用字段类型＆＃34; ip＆＃34;给出了同样的错误。

这里出现错误信息：

[2018-06-05T01:45:32,102][WARN ][logstash.outputs.elasticsearch] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"xxx-logstash-2018.06.05", :_type=>"doc", :_routing=>nil}, #<LogStash::Event:0x43ff9351>], :response=>{"index"=>{"_index"=>"xxx-logstash-2018.06.05", "_type"=>"doc", "_id"=>nil, "status"=>400, "error"=>{"type"=>"illegal_argument_exception", "reason"=>"unknown index sort field:[@timestamp]"}}}}

这里是字段映射：

"properties": {
        "@timestamp": {
          "type": "date",
          "format": "dateOptionalTime"
        },
        "log_date": {
          "type": "date"
        },
        "@version": {
          "type": "keyword"
        },
        "geoip": {
          "dynamic": true,
          "properties": {
            "ip": {
              "type": "ip"
            },
            "location": {
              "type": "geo_point"
            },
            "latitude": {
              "type": "half_float"
            },
            "longitude": {
              "type": "half_float"
            }
          }
        }
      }

这里是索引模板设置：

"settings": {
    "index": {
      "codec": "best_compression",
      "refresh_interval": "30s",
      "sort": {
        "field": "@timestamp",
        "order": "desc"
      },
      "store": {
        "type": "niofs"
      },
      "number_of_shards": "3",
      "number_of_replicas": "1"
    }
  },