# Using an array as parameter for update script
**URL:** https://discuss.elastic.co/t/using-an-array-as-parameter-for-update-script/202998
**Category:** Elasticsearch
**Created:** [October 10, 2019, 10:04am UTC](https://discuss.elastic.co/t/using-an-array-as-parameter-for-update-script/202998 "2019-10-10T10:04:30Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@MMH](https://discuss.elastic.co/u/MMH)
#### Post date: [October 10, 2019, 10:04am UTC](https://discuss.elastic.co/t/using-an-array-as-parameter-for-update-script/202998/1 "2019-10-10T10:04:30Z")
I am using ElasticSearch 6.5, invoking commands by Kibana 6.5.
My documents have `user` field which is an array of user structures. I want to construct a script, that will update some of the structures in this array based on the identifier stored in the structure.
Code I came to so far:
```auto
POST test_idx1/_doc/1/_update
{
"script": """
for (int i = 0; i < params.src.size(); i++) {
boolean f = false;
for (int j = 0; j < ctx._source.user.size(); j++) {
if (ctx._source.user[j].uid == params.src[i].uid) {
ctx._source.user[j].first = params.src[i].first;
ctx._source.user[j].last = params.src[i].last;
f=true;
break;
}
}
if(!f){ctx._source.user.add(params.src[i]);}
}""",
"params": {
"src": [
{
"uid" : 1,
"first": "John_u",
"last": "Smith_u"
},
{
"uid" : 2,
"first": "Bob_u",
"last": "Jones_u"
},
{
"uid" : 4,
"first": "Anna_u",
"last": "Right_u"
}
]
}
}
```
But it ends with an error:
```auto
{
"error": {
"root_cause": [
{
"type": "remote_transport_exception",
"reason": "[T-Qm5ly][127.0.0.1:9300][indices:data/write/update[s]]"
}
],
"type": "illegal_argument_exception",
"reason": "failed to execute script",
"caused_by": {
"type": "script_exception",
"reason": "runtime error",
"script_stack": [
"i = 0; i < params.src.size(); i++) {\n boolean ",
" ^---- HERE"
],
"script": " for (int i = 0; i < params.src.size(); i++) {\n boolean f = false;\n for (int j = 0; j < ctx._source.user.size(); j++) {\n if (ctx._source.user[j].uid == params.src[i].uid) {\n ctx._source.user[j].first = params.src[i].first;\n ctx._source.user[j].last = params.src[i].last;\n f=true;\n break;\n }\n }\n if(!f){ctx._source.user.add(params.src[i]);}\n }",
"lang": "painless",
"caused_by": {
"type": "null_pointer_exception",
"reason": null
}
}
},
"status": 400
}
```
So it seems, like `params.src` is null, while I am providing values for it in `params` section.
What am I doing wrong?
---
### Author:  [@MMH](https://discuss.elastic.co/u/MMH)
#### Post date: [October 10, 2019, 12:12pm UTC](https://discuss.elastic.co/t/using-an-array-as-parameter-for-update-script/202998/2 "2019-10-10T12:12:21Z")
Ok, I detected the issue. Script code and `params` section have to be nested inside the `script` section.
This code is working:
```auto
POST test_idx1/_doc/1/_update
{
"script": {
"source" : """
for (int i = 0; i < params.src.size(); i++) {
boolean f = false;
for (int j = 0; j < ctx._source.user.size(); j++) {
if (ctx._source.user[j].uid == params.src[i].uid) {
ctx._source.user[j].first = params.src[i].first;
ctx._source.user[j].last = params.src[i].last;
f=true;
break;
}
}
if(!f){ctx._source.user.add(params.src[i]);}
}""",
"lang" : "painless",
"params": {
"src": [
{
"uid" : 1,
"first": "John_u",
"last": "Smith_u"
},
{
"uid" : 2,
"first": "Bob_u",
"last": "Jones_u"
},
{
"uid" : 4,
"first": "Anna_u",
"last": "Right_u"
}
]
}
}
}
```
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 7, 2019, 12:12pm UTC](https://discuss.elastic.co/t/using-an-array-as-parameter-for-update-script/202998/3 "2019-11-07T12:12:36Z")
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