elasticsearch text字段排序报错解决

朱雀 2022-09-30 03:36 386阅读 0赞

# elasticsearch text字段排序报错解决 #

使用elasticsearch 进行排序的时候，我们一般都会排序数字、日期。但是在排序text类型的时候就会出现错误。

**GET xytest/sutdent/\_search  
\{  
  "sort":\[  
      \{"region": \{"order": "asc"\}\}  
    \]  
  , "from": 0  
  , "size": 2  
\}**

结果如下：

**\{  
  "error": \{  
    "root\_cause": \[  
      \{  
        "type": "illegal\_argument\_exception",  
        "reason": "Fielddata is disabled on text fields by default. Set fielddata=true on \[region\] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory."  
      \}  
    \],  
    "type": "search\_phase\_execution\_exception",  
    "reason": "all shards failed",  
    "phase": "query",  
    "grouped": true,  
    "failed\_shards": \[  
      \{  
        "shard": 0,  
        "index": "xytest",  
        "node": "6h-7wPJmQqWGfz6nbgqjjQ",  
        "reason": \{  
          "type": "illegal\_argument\_exception",  
          "reason": "Fielddata is disabled on text fields by default. Set fielddata=true on \[region\] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory."  
        \}  
      \}  
    \],  
    "caused\_by": \{  
      "type": "illegal\_argument\_exception",  
      "reason": "Fielddata is disabled on text fields by default. Set fielddata=true on \[region\] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory."  
    \}  
  \},  
  "status": 400  
\}**

主要原因是："Fielddata is disabled on text fields by default. Set fielddata=true on \[region\] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory."

参考官方文档：

https://www.elastic.co/guide/en/elasticsearch/reference/current/fielddata.html

**方案一：我们可以用region.keyword进行聚合，排序。用region用来查询。** 那么我们对我们的查询进行修改

**GET xytest/sutdent/\_search  
\{  
  "sort":\[  
      \{"region.keyword": \{"order": "asc"\}\}  
    \]  
  , "from": 0  
  , "size": 2  
\}**

修改后查询结果：

**\{  
  "took": 1,  
  "timed\_out": false,  
  "\_shards": \{  
    "total": 5,  
    "successful": 5,  
    "failed": 0  
  \},  
  "hits": \{  
    "total": 6,  
    "max\_score": null,  
    "hits": \[  
      \{  
        "\_index": "xytest",  
        "\_type": "sutdent",  
        "\_id": "6",  
        "\_score": null,  
        "\_source": \{  
          "sid": "00006",  
          "name": "牧琢杭",  
          "age": "26",  
          "region": "广东省 湛江市 赤坎区",  
          "grade": \[  
            \{  
              "数学": 80  
            \},  
            \{  
              "语文": 63  
            \},  
            \{  
              "英语": 90  
            \}  
          \]  
        \},  
        "sort": \[  
          "广东省 湛江市 赤坎区"  
        \]  
      \},  
      \{  
        "\_index": "xytest",  
        "\_type": "sutdent",  
        "\_id": "5",  
        "\_score": null,  
        "\_source": \{  
          "sid": "00005",  
          "name": "范旭",  
          "age": "30",  
          "region": "新疆维吾尔自治区 和田地区 和田县",  
          "grade": \[  
            \{  
              "数学": 90  
            \},  
            \{  
              "语文": 69  
            \},  
            \{  
              "英语": 60  
            \}  
          \]  
        \},  
        "sort": \[  
          "新疆维吾尔自治区 和田地区 和田县"  
        \]  
      \}  
    \]  
  \}  
\}**

**方案二：这是region这个排序字段的fileddata为true。**

**PUT xytest/\_mapping/sutdent  
\{  
  "properties": \{  
    "region":\{  
      "type": "text",  
      "fielddata": true  
    \}  
  \}  
\}**

设置结果：

**\{  
  "acknowledged": true  
\}**

我们再次运行最开始的查询：

**GET xytest/sutdent/\_search  
\{  
  "sort":\[  
      \{"region": \{"order": "asc"\}\}  
    \]  
  , "from": 0  
  , "size": 2  
\}**

返回结果：

**\{  
  "took": 130,  
  "timed\_out": false,  
  "\_shards": \{  
    "total": 5,  
    "successful": 5,  
    "failed": 0  
  \},  
  "hits": \{  
    "total": 6,  
    "max\_score": null,  
    "hits": \[  
      \{  
        "\_index": "xytest",  
        "\_type": "sutdent",  
        "\_id": "6",  
        "\_score": null,  
        "\_source": \{  
          "sid": "00006",  
          "name": "牧琢杭",  
          "age": "26",  
          "region": "广东省 湛江市 赤坎区",  
          "grade": \[  
            \{  
              "数学": 80  
            \},  
            \{  
              "语文": 63  
            \},  
            \{  
              "英语": 90  
            \}  
          \]  
        \},  
        "sort": \[  
          "东"  
        \]  
      \},  
      \{  
        "\_index": "xytest",  
        "\_type": "sutdent",  
        "\_id": "4",  
        "\_score": null,  
        "\_source": \{  
          "sid": "00004",  
          "name": "符龙",  
          "age": "37",  
          "region": "河北省 保定市 清苑县",  
          "grade": \[  
            \{  
              "数学": 80  
            \},  
            \{  
              "语文": 79  
            \},  
            \{  
              "英语": 69  
            \}  
          \]  
        \},  
        "sort": \[  
          "保"  
        \]  
      \}  
    \]  
  \}  
\}**