Question

Trying to figure out how to sort elasticsearch results so that fields with specific values always show first. In this case, I want specific SKUs to show first when showing category pages (I'm using bool query to generate elasticsearch results for category pages).

If I were trying to accomplish this with MySQL, I'd use the case statement:

ORDER BY CASE sku
    WHEN 'sku1' then 1 WHEN 'sku2' then 2 WHEN 'sku3' then 3 ELSE 4 END

This query executes:

{
    "sort" : [
        {
          "_script": {
            "type": "number",
            "script": {
                "inline" : "params.sortOrder.indexOf(doc['skuid_text'].value)",
                "params": {
                  "sortOrder": [
                    "SKUID1",
                    "SKUID2",
                    "SKUID3"
                  ]
                }           
            },
            "order": "asc"
          }
        }
    ],
    "query" :{
        "bool" : {
            "must" : [
                {
                    "term" : {
                        "category_codes" : "CATEGORY1"
                    }
                }
            ]
        }
    }
}

But it's returning "-1" as the sort value for all records, eg:

sort": [
    -1
]

Note: 'skuid_text' is the SKU field I have analyzed as "keyword" type. I have tried both doc['skuid_text'].value and doc['skuid_text'] And I have verified that SKUs in the "sortOrder" array are definitely included in the result set.

What am I missing? Or, is there a completely different way to approach the problem?

Answer 1

实际上原始查询有点工作，只是我用“asc”命令的方式是将sortOrder数组中的所有skus推到最后。

如果你在sortOrder中反转skus的顺序并对其进行一些数学计算，它将正确排序。虽然有点hack-y。我很想知道是否有更好的方式让人想到。

{
    "sort" : [
        {
          "_script": {
            "type": "number",
            "script": {
                "inline" : "(9999)-params.sortOrder.indexOf(doc['skuid_text'].value)",
                "params": {
                  "sortOrder": [
                    "SKUID3",
                    "SKUID2",
                    "SKUID1"
                  ]
                }           
            },
            "order": "asc"
          }
        }
    ],
    "query" :{
        "bool" : {
            "must" : [
                {
                    "term" : {
                        "category_codes" : "CATEGORY1"
                    }
                }
            ]
        }
    }
}

Answer 2

这个插件完成了＆lt; 5版本所需的功能。您可以按原样尝试安装，或者查看作者对5.x更新的评价。

https://github.com/jprante/elasticsearch-functionscore-conditionalboost

Sort or Order by specific values with Elasticsearch 5

2 个答案: