我对bool查询中的用法应该有点混淆。当你在SHOULD和MUST子句中有几个过滤器时,它们可以放在同一级别还是应该嵌套?
下面是我的数据的简化版本以及我测试的两个查询,第一个是失败的,后者是失败的。在实际操作中,我必须有许多过滤器。
我开始相信,如果想要组合几个SHOULD和MUST过滤器,那么外层过滤器必须始终是应该的。这是正确的假设吗?如果我想使用MUST_NOT,它应该放在这个上下文中吗?
我的数据:
_index,_type,_id,_score,_source.id,_source.type,_source.valueType,_source.sentence,_source.location
"test","var","0","1","0","study","text","Lorem text is jumbled","spain"
"test","var","1","1","1","study","text","bla bla bla","spain"
"test","var","2","1","2","schema","decimal","ipsum","germany"
"test","var","3","1","3","study","integer","lorem","france"
这是失败的查询:
{
"query": {
"filtered": {
"query": {
"match_all": {}
},
"filter": {
"bool": {
"must": {
"terms": {
"location": [
"germany"
]
}
},
"should": {
"terms": {
"valueType": [
"integer"
]
}
}
}
}
}
}
}
这是我的WORKING查询返回ID 2和3:
{
"query": {
"bool": {
"should": [
{
"terms": {
"location": [
"germany"
]
}
},
{
"bool": {
"must": [
{
"terms": {
"valueType": [
"integer"
]
}
}
]
}
}
]
}
}
}
非常感谢。
答案 0 :(得分:0)
首先需要了解过滤器的含义。
复合过滤器:
must
条款是必需的(和)
should
子句是可选的(或)
因此,在第一个区块中,您正在检查term
中的must
(和)。所以这个术语必须是结果集。并且(或)cond 2可能会或可能不会在结果集中。
{
"query": {
"filtered": {
"query": {
"match_all": {}
},
"filter": {
"bool": {
"must": {
....... Cond 1
},
"should": {
....... Cond 2
}
}
}
}
}
}
在您的工作场景中,您正在查询工作,因为应该检查Cond 1或Cond 2。
{
"query": {
"bool": {
"should": [ // OR
{
...... Cond 1
},
{
...... Cond 2
}
]
}
}
}