Elasticsearch搜索出现NAN异常-Toy模板网

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原因分析

Elasticsearch默认的打分，一般是不会出现异常的
之所以会出现NAN异常，往往是因为我们重新计算了打分，使用了function_score
核心原因是在function_score中，出现了计算异常，比如 0/0,比如log1p(x),x为负数等

真实案例分析

测试索引

PUT tx
POST tx/_mapping
{
      "properties" : {
        "age" : {
          "type" : "long"
        },
        "time" : {
          "type" : "date",
          "format" : "yyyy-MM-dd"
        },
        "title" : {
          "type" : "text",
          "analyzer" : "ik_smart"
        }
      }
}
POST tx/_doc/19
{
  "title":"中古",
   "time" : "1969-10-12",
   "age":12
}

搜索query示例

POST /tx/_search
{
  "query": {
    "function_score": {
      "query": {
          "match_all": {}
      },
      "field_value_factor": {
        "field": "time",
        "modifier": "log1p"
      }
    }
  }
}
- 其实modifier.log1p和如下搜索是完全一样的
POST /tx/_search
{
  "query": {
    "function_score": {
      "query": {
        "match_all": {}
      },
      "script_score": {
        "script": "_score * Math.log1p(1+doc['time'].value.toInstant().toEpochMilli())"
      }
    }
  }
}

搜索异常返回值

{
  "error" : {
    "root_cause" : [
      {
        "type" : "exception",
        "reason" : "function score query returned an invalid score: NaN for doc: 0"
      }
    ],
    "type" : "search_phase_execution_exception",
    "reason" : "all shards failed",
    "phase" : "query",
    "grouped" : true,
    "failed_shards" : [
      {
        "shard" : 0,
        "index" : "tx",
        "node" : "aPOBCVYkRA-a0R9FR4eDzQ",
        "reason" : {
          "type" : "exception",
          "reason" : "function score query returned an invalid score: NaN for doc: 0"
        }
      }
    ]
  },
  "status" : 500
}