Upsert document such that it would update the particular item in an array field - elasticsearch

Question

In Elasticsearch, say I have the document like this:
{
"inputs": [
{
"id": "1234",
"value": "ABCD"
},
{
"id": "5678",
"value": "EFGH"
}
]
}
Say, now, I wanted to update value of all items where id is "1234" to "XYZA". How can I do that using script in elasticsearch? I am not sure if I can do some for loop in script?

Answer 1

Mapping:
{
"inputs" : {
"mappings" : {
"properties" : {
"inputs" : {
"type" : "nested",
"properties" : {
"id" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
},
"value" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
}
}
}
}
}
}
}
Query:
You can use _update_by_query api. Query part will filter out documents and script will update the field
<1. When inputs is of nested type
POST inputs/_update_by_query
{
"script": {
"source": "for(a in ctx._source['inputs']){if(a.id=='1234') a.value=params.new_value; }",
"params": {
"new_value": "XYZA"
}
},
"query": {
"nested":{
"path":"inputs",
"query":{
"term":{
"inputs.id":1234
}
}
}
}
}
2. When inputs if of object type
POST inputs/_update_by_query
{
"script": {
"source": "for(a in ctx._source['inputs']){if(a.id=='1234') a.value=params.new_value; }",
"params": {
"new_value": "XYZA"
}
},
"query": {
"term": {
"inputs.id": 1234
}
}
}
Result:
"hits" : [
{
"_index" : "inputs",
"_type" : "_doc",
"_id" : "3uwrwHEBLcdvQ7OTrUmi",
"_score" : 1.0,
"_source" : {
"inputs" : [
{
"id" : "1234",
"value" : "XYZA"
},
{
"id" : "5678",
"value" : "EFGH"
}
]
}
}
]