null_value
编辑null_value
编辑null 值无法被索引或搜索。当一个字段被设置为 null 时，（或者一个空数组或一个包含 null 值的数组），它会被视为该字段没有值。
null_value 参数允许你将显式的 null 值替换为指定的值，以便可以对其进行索引和搜索。例如：
resp = client.indices.create(
index="my-index-000001",
mappings={
"properties": {
"status_code": {
"type": "keyword",
"null_value": "NULL"
}
}
},
)
print(resp)
resp1 = client.index(
index="my-index-000001",
id="1",
document={
"status_code": None
},
)
print(resp1)
resp2 = client.index(
index="my-index-000001",
id="2",
document={
"status_code": []
},
)
print(resp2)
resp3 = client.search(
index="my-index-000001",
query={
"term": {
"status_code": "NULL"
}
},
)
print(resp3)
response = client.indices.create(
index: 'my-index-000001',
body: {
mappings: {
properties: {
status_code: {
type: 'keyword',
nil_value: 'NULL'
}
}
}
}
)
puts response
response = client.index(
index: 'my-index-000001',
id: 1,
body: {
status_code: nil
}
)
puts response
response = client.index(
index: 'my-index-000001',
id: 2,
body: {
status_code: []
}
)
puts response
response = client.search(
index: 'my-index-000001',
body: {
query: {
term: {
status_code: 'NULL'
}
}
}
)
puts response
const response = await client.indices.create({
index: "my-index-000001",
mappings: {
properties: {
status_code: {
type: "keyword",
null_value: "NULL",
},
},
},
});
console.log(response);
const response1 = await client.index({
index: "my-index-000001",
id: 1,
document: {
status_code: null,
},
});
console.log(response1);
const response2 = await client.index({
index: "my-index-000001",
id: 2,
document: {
status_code: [],
},
});
console.log(response2);
const response3 = await client.search({
index: "my-index-000001",
query: {
term: {
status_code: "NULL",
},
},
});
console.log(response3);
PUT my-index-000001
{
"mappings": {
"properties": {
"status_code": {
"type": "keyword",
"null_value": "NULL"
}
}
}
}
PUT my-index-000001/_doc/1
{
"status_code": null
}
PUT my-index-000001/_doc/2
{
"status_code": []
}
GET my-index-000001/_search
{
"query": {
"term": {
"status_code": "NULL"
}
}
}
null_value 需要与字段的数据类型相同。 例如，一个 long 类型的字段不能有字符串类型的 null_value。
null_value 仅影响数据的索引方式，它不会修改 _source 文档。