Elasticsearch-使用条件衰减函数搜索多个索引 [英] Elasticsearch - search across multiple indices with conditional decay function

问题描述

我试图用一个查询搜索多个索引，但仅将高斯衰减函数应用于存在于其中一个索引上的字段.

I'm trying to search across multiple indices with one query, but only apply the gaussian decay function to a field that exists on one of the indices.

我正在通过elasticsearch-api gem运行此部分，并且该部分工作正常.

I'm running this through elasticsearch-api gem, and that portion works just fine.

这是我在奇迹中运行的查询.

Here's the query I'm running in marvel.

GET episodes,shows,keywords/_search?explain
{
"query": {
  "function_score": {
    "query": {
      "multi_match": {
        "query": "AWESOME SAUCE",
        "type": "most_fields",
        "fields": [ "title", "summary", "show_title"]
      }
    },
    "functions": [
      { "boost_factor":  2 },
      {
        "gauss": {
          "published_at": {
            "scale": "4w"
          }
        }
      }
    ],
  "score_mode": "multiply"
  }
},
  "highlight": {
  "pre_tags": ["<span class='highlight'>"],
  "post_tags": ["</span>"],
  "fields": {
    "summary": {},
    "title": {},
    "description": {}
   }
 }
}

该查询对情节索引非常有用，因为它具有高斯函数的published_at字段，以发挥其魔力.但是，当跨所有索引运行时，它对于显示和关键字失败(对于情节仍然成功).

The query works great for the episodes index because it has the published_at field for the gauss func to work its magic. However, when run across all indices, it fails for shows and keywords (still succeeds for episodes).

如果published_at字段存在或在单集索引上，是否可以运行条件高斯衰减函数?

Is it possible to run a conditional gaussian decay function if the published_at field exists or on the single episodes index?

我愿意探索替代方法(例如，对每个索引运行单独的查询，然后合并结果)，但是我认为单个查询在性能方面是最好的.

I'm willing to explore alternatives (i.e. run separate queries for each index and then merge the results), but thought a single query would be the best in terms of performance.

谢谢！

推荐答案

您可以添加过滤器，以将那些高斯衰减函数仅应用于文档的子集:

You can add a filter to apply those gaussian decay function only to a subset of documents:

{
  "filter": {
    "exists": {
      "field": "published_at"
    }
  }
  "gauss": {
    "published_at": {
      "scale": "4w"
    }
  }
}

对于没有该字段的文档，您可以返回0分:

For docs that don't have the field you can return a score of 0:

{
  "filter": {
    "missing": {
      "field": "published_at"
    }
  }
  "script_score": {
    "script": "0"
  }
}

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