elasticsearch - 使用NEST(ElasticSearch)按多个值搜索

Question

我有一个名为“ campaigns ”的索引，其中包含以下记录:

"hits" : [
  {
    "_index" : "campaigns",
    "_id" : "cf08b05c-c8b5-45cb-bca8-17267c3613fb",
    "_source" : {
      "PublisherId" : 1,
      "CurrentStatus" : "Pending"
    }
  },
  {
    "_index" : "campaigns",
    "_id" : "39436cb3-483e-4fb4-92e4-4e06ecad27a1",
    "_source" : {
      "PublisherId" : 1,
      "CurrentStatus" : "Approved"
    }
  }, 
{
    "_index" : "campaigns",
    "_id" : "21436cb1-583e-4fb4-92e4-4e06ecad23a2",
    "_source" : {
      "PublisherId" : 1,
      "CurrentStatus" : "Rejected"
    }
  }
]

我想获取所有带有“ PublisherId = 1 ”且状态在“ 已批准，已拒绝”之间的广告系列。像这样:

var statuses = new[] {CampaignStatus.Approved,CampaignStatus.Rejected};
campaigns.Where(c=> c.PublisherId == 1 && statuses.Contains(c.CurrentStatus)).ToList();

如何使用NEST运行此查询？
预期结果:

"hits" : [
  {
    "_index" : "campaigns",
    "_id" : "39436cb3-483e-4fb4-92e4-4e06ecad27a1",
    "_source" : {
      "PublisherId" : 1,
      "CurrentStatus" : "Approved"
    }
  }, 
{
    "_index" : "campaigns",
    "_id" : "39436cb3-483e-4fb4-92e4-4e06ecad27a1",
    "_source" : {
      "PublisherId" : 1,
      "CurrentStatus" : "Rejected"
    }
  }
]

Answer 1

我不知道nest的语法，但是由于ES是基于REST的，提供了JSON格式的工作示例查询，您可以将其转换为nest代码。
索引映射

{
    "mappings": {
        "properties": {
            "PublisherId": {
                "type": "integer"
            },
            "CurrentStatus": {
                "type": "text"
            }
        }
    }
}

索引所有三个示例文档，并在下面的搜索查询中使用

{
    "query": {
        "bool": {
            "must": {
                "term": {
                    "PublisherId": 1
                }
            },
            "should": [
                {
                    "match": {
                        "CurrentStatus": "Rejected"
                    }
                },
                {
                     "match": {
                        "CurrentStatus": "Approved"
                    }
                }
            ],
            "minimum_should_match" : 1
        }
    }
}

搜索结果

"hits": [
            {
                "_index": "stof_63968525",
                "_type": "_doc",
                "_id": "1",
                "_score": 1.9808291,
                "_source": {
                    "PublisherId": 1,
                    "CurrentStatus": "Approved"
                }
            },
            {
                "_index": "stof_63968525",
                "_type": "_doc",
                "_id": "3",
                "_score": 1.9808291,
                "_source": {
                    "PublisherId": 1,
                    "CurrentStatus": "Rejected"
                }
            }
        ]

请注意 minimum_should_match的使用，它会迫使状态 Rejected和 Approved中的至少一个匹配并引用 bool query in ES来理解查询构造。