我是OData服务的新手，我编写了一个查询来检索具有空值的特定字段。我在OData中构建了查询，然后将其传递给弹性搜索以检索数据。但是查询似乎无法正常工作。
The query is as follows:
$filter=assignedToEM eq null.
I have also tried giving as: $filter=assignedToEM eq 'null'
The query has been built as :
{
"from" : 0,
"size" : 15,
"query":{
"bool" : {
"must_not" : {
"term" : {
"assignedToEM" : "null"
}
}
}
}
}
In elastic search schema,The not_null value for assignedToEM is given as "_null_".
It would be really helpful if i get a solution for this as soon as possible.
Thanks.
实现此目的的一种方法是改为使用特殊字段名称创建query_string查询_missing_，如下所示：
{
"from": 0,
"size": 15,
"query": {
"query_string": {
"query": "_missing_:assignedToEM"
}
}
}
或者也应该使用NOT像这样的运算符：
{
"from": 0,
"size": 15,
"query": {
"query_string": {
"query": "NOT(assignedToEM:*)"
}
}
}
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