Question

我们在使用Elasticsearch中的搜索模板来构建日期范围查询时遇到问题。使用一个条件子句，它可以正常工作，但是当提供多个条件时，我们将遇到以下错误。

myConnection.Open()

Dim str As String = "SELECT fullname' FROM STUDENTS"
Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand(str, myConnection)

dr = cmd.ExecuteReader

Dim dt As New DataTable

dt.Load(dr)

ListBox1.DataSource = dt
myConnection.Close()

错误：

    {
  "script": {
    "lang": "mustache",
    "source": "{
         \"query\":{
              \"bool\":{
                  \"must\":[
                     {{#since}}
                      {\"range\": 
                        {\"@timestamp\": 
                            {
                              {{#from}}\"from\":\"{{from}}\"{{/from}}
                            }
                         }
                       },{{/since}}
                       {\"query_string\":
                           {
                             \"query\":\"(title:({{query_string}}))\"
                           }
                        }
                      ]
                   }
                  }
               }"
             }
           }

查询：

{ “ id”：“ dateTemplate”， “参数”：{ “请求参数”： ”*” } }

对于此模板，Same工作正常：

{
error: {
root_cause: [
{
type: "general_script_exception",
reason: "Failed to compile stored script [dateTemplate] using lang [mustache]",
}
],
type: "general_script_exception",
reason: "Failed to compile stored script [dateTemplate] using lang [mustache]",
caused_by: {
type: "mustache_exception",
reason: "Improperly closed variable in query-template:1",
},
},
status: 500,
}

查询

{
  "script": {
    "lang": "mustache",
    "source": "{\"query\":{\"bool\":{\"must\":[{{#since}}{\"range\": {\"@timestamp\": {\"from\": \"{{since}}\"}}},{{/since}}{\"query_string\":{\"query\":\"(title:({{query_string}}))\"}}]}}}"
  }
}

Answer 1

首先，我建议您使用三引号将模板重写，因为这样更易于阅读和维护：

POST _scripts/dateTemplate
{
  "script": {
    "lang": "mustache",
    "source": """
      {
        "query": {
          "bool": {
            "must": [
              {{#since}}
              {
                "range": {
                  "@timestamp": {
                    {{#from}}"from": "{{from}}"{{/from}}
                  }
                }
              },
              {{/since}}
              {
                "query_string": {
                  "query": "(title:({{query_string}}))"
                }
              }
            ]
          }
        }
      }
    """
  }
}

然后，调用该查询的正确方法是这样的（即，您在params对象中缺少了from变量）：

{
  "id": "dateTemplate",
  "params": {
    "query_string": "*",
    "since": {
      "from": "2018-07-23"
    }
  }
}

在Elasticsearch中使用搜索模板进行日期范围查询

1 个答案: