为 Elasticsearch 设置 update_time（qbit）

前言

• 本文对 Elasticsearch 7.17 有效
• 创建时间（create_time）没找到好的实现方式
• 如果入库的数据不再更新，文中的 update_time 可等同于 create_time

update_time 示例

• 创建 Ingest pipelines（script、date）

PUT _ingest/pipeline/add_update_time
{
  "processors": [
    {
      "script": {
        "lang": "painless",
        "source": """DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX"); df.setTimeZone(TimeZone.getTimeZone("Asia/Shanghai")); Date date = new Date(); ctx.update_time = df.format(date);"""
      }
    }
  ]
}

• 查看 pipeline

// 查看所有 pipeline
GET _ingest/pipeline
// 查看具体的 pipeline
GET _ingest/pipeline/add_update_time

• 创建索引，并设置默认 pipeline

PUT my_index
{
  "settings": {
    "index.default_pipeline": "add_update_time"
  }
}

• 插入数据

POST my_index/_doc/1
{
  "title": "nothing"
}

• 查看 mapping

GET my_index/_mapping

{
  "my_index" : {
    "mappings" : {
      "properties" : {
        "title" : {
          "type" : "text",
          "fields" : {
            "keyword" : {
              "type" : "keyword",
              "ignore_above" : 256
            }
          }
        },
        "update_time" : {
          "type" : "date"
        }
      }
    }
  }
}

• 查询数据

GET my_index/_search
{
  "query": {
    "range": {
      "update_time": {
        "time_zone": "+08",        
        "gte": "2021-07-28T16:00:00", 
        "lte": "now"                  
      }
    }
  }
}

{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "my_index",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "update_time" : "2021-07-28T18:03:35+08",
          "title" : "nothing"
        }
      }
    ]
  }
}

本文出自 qbit snap