ElasticSearch 修改字段类型 (elasticsearch鏁版嵁绫诲瀷)

在日常开发中，可能会疏忽而未指定字段类型，而es会默认根据插入的数据去映射有可能不符合你期望的类型，从而导致后续的某些问题。由于ElasticSearch不支持直接修改字段类型， 因此需要借助中间索引并搭配_reindex来重新索引数据

操作步骤

创建中间索引设置中间索引_mapping_reindex 重新索引数据删除有问题的旧索引重新创建同名新索引（_mapping中字段类型正确）_reindex 中间索引数据至新索引删除中间索引

# 创建中间索引
PUT asr_202203_back/

# 创建Mapping
POST asr_202203_back/asr/_mapping
{
  "asr": {
    "_source": {
      "enabled": true
    },
    "properties": {
      "callId": {
        "type": "keyword"
      },
      "fileName": {
        "type": "keyword"
      },
      "level": {
        "type": "integer"
      },
      "enterpriseId": {
        "type": "integer"
      },
      "tag": {
        "type": "keyword"
      },
      "taskId": {
        "type": "keyword"
      }
    }
  }
}

# 向中间索引备份源索引的数据
# 重建索引
POST _reindex
{
  "source": {
    "index": "asr_202203"
  },
  "dest": {
    "index": "asr_202203_back"
  }
}

GET /asr_202203_back/_search

# 删除有问题的索引
DELETE asr_202203

# 重新创建同名的索引
# 创建索引
PUT asr_202203/

# 创建Mapping
POST asr_202203/asr/_mapping
{
  "asr": {
    "_source": {
      "enabled": true
    },
    "properties": {
      "callId": {
        "type": "keyword"
      },
      "fileName": {
        "type": "keyword"
      },
      "level": {
        "type": "integer"
      },
      "enterpriseId": {
        "type": "integer"
      },
      "tag": {
        "type": "keyword"
      },
      "taskId": {
        "type": "keyword"
      }
    }
  }
}

# 从中间索引还原到源索引的数据
# 重建索引
POST _reindex
{
  "source": {
    "index": "asr_202203_back"
  },
  "dest": {
    "index": "asr_202203"
  }
}
# 查询验证是否正确
GET asr_202203_alias/_search
GET asr_202203_alias/_mapping

# 删除中间索引
DELETE asr_202203_back