Elasticsearch override field value in search results - elasticsearch

Question

The use case is that, I want to hide product price(change to 0) if a user is not logged in.
PUT /products
{
"mappings": {
"properties": {
"price": {
"type": "scaled_float",
"scaling_factor": 100
}
}
}
}
POST /products/_doc
{
"price": 101
}
POST /products/_doc
{
"price": 102
}
POST /products/_doc
{
"price": 103
}
I try to use runtime_mapping with the following script, but the result still has the original data.
GET /products/_search
{
"query": {
"match_all": {}
},
"runtime_mappings": {
"price": {
"type": "double",
"script": "if(0 == 1) {emit(333);} else{emit(222);}"
}
}
}
What do I miss? Is it the script condition invalid?
Thanks.
-- Edit --
I expect all the price to be 222. But the original price is returned.
Expected out put:
{
"took" : 4,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 4,
"relation" : "eq"
},
"max_score" : 1.0,
"hits" : [
{
"_index" : "products",
"_id" : "XXphNoMBcFxgyV6Mwe1-",
"_score" : 1.0,
"_source" : {
"price" : 222
}
},
{
"_index" : "products",
"_id" : "XnphNoMBcFxgyV6Mye2c",
"_score" : 1.0,
"_source" : {
"price" : 222
}
},
{
"_index" : "products",
"_id" : "X3phNoMBcFxgyV6M0e2W",
"_score" : 1.0,
"_source" : {
"price" : 222
}
},
{
"_index" : "products",
"_id" : "YHphNoMBcFxgyV6M3u0V",
"_score" : 1.0,
"_source" : {
"price" : 222
}
}
]
}
}
Actual output:
{
"took" : 4,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 4,
"relation" : "eq"
},
"max_score" : 1.0,
"hits" : [
{
"_index" : "products",
"_id" : "XXphNoMBcFxgyV6Mwe1-",
"_score" : 1.0,
"_source" : {
"price" : 101
}
},
{
"_index" : "products",
"_id" : "XnphNoMBcFxgyV6Mye2c",
"_score" : 1.0,
"_source" : {
"price" : 102
}
},
{
"_index" : "products",
"_id" : "X3phNoMBcFxgyV6M0e2W",
"_score" : 1.0,
"_source" : {
"price" : 105
}
},
{
"_index" : "products",
"_id" : "YHphNoMBcFxgyV6M3u0V",
"_score" : 1.0,
"_source" : {
"price" : 0
}
}
]
}
}

Answer 1

After retry on the example in the official doc, I realized that I missed out the fields key in query body.
GET /products/_search
{
"query": {
"match_all": {}
},
"runtime_mappings": {
"price": {
"type": "double",
"script": "if(0 == 1) {emit(333);} else{emit(222);}"
}
},
"fields": ["price"]
}
Now I get both the original and script fields.