ElasticSearch 6.7 painless, how to access nested document - elasticsearch

Question

When I use ES 5.5 update to 6.7.
Painless script does’t work
This is 5.5
If I want get a nested document [transFilter]
I do this
params['_source’]['carFilter’]
It works very well。
But
When I used 6.7 version
params['_source’]['carFilter’]
I found it does’t work
All params['_source’] is null
my mappings
carFilter": {
"type": "nested",
"properties": {
"time": {
"type": "long"
}
}
}
my data example
"carFilter" : [
{
"time" : 20200120
},
{
"time" : 20200121
}
]
and my query script example
{
"query" : {
"bool" : {
"must" : [
{
"script" : {
"script" : {
"inline" : "if(params['_source']!=null){
if(params['_source']['carFilter']!=null){
for(def item:params['_source']['carFilter'] ){
if (item.time>1) { return true; }
}
}
}
return false;",
"lang" : "painless",
"params" : {
"rentTime" : 1000
}
}
}
}
]
}
}
}
even no error
but fact
if(params['_source']!=null){
this line already return
The simple painless above is just to illustrate the problem, and a relatively real one is attached below.
double carPrice=0.00;if(!params['_source'].empty){"+
" def days=params['_source']['everyDayPrice'];if(params['_source']['everyDayPrice']!=null){int size=days.length;" +
" if(size>0){for(int i=0;i<size;i++){String day = days[i]['day'];Double price = days[i]['price'];"+
" if(price!=null&&params.get(day)!=null){carPrice=carPrice+params.get(day)*price;}}}}}" +
" return carPrice/params.total"

Answer 1

Looking at your query, you would want to filter the documents having carFilter.time > 1 and why not use a simple Nested Query:
POST <your_index_name>/_search
{
"query": {
"bool": {
"must": [
{
"nested": {
"path": "carFilter",
"query": {
"range": {
"carFilter.time": {
"gte": 1
}
}
}
}
}
]
}
}
}
Note that I've made use of Range Query to evaluate the time based on what you are looking for.
I'd suggest you go through this answer if the above doesn't help.
Let me know if you have any queries.