Shards are failing becuase of script field painless

[PRUDHVI_CHOWDHARY_NE (Prudhvi Chowdhary Nekkalapudi)]

mappings used

PUT kpal
{
  "mappings": {
    "_doc": {
      "properties": {
        "user": {
          "type": "nested" 
        }
      }
    }
  }
}

PUT kpal/_doc/1
{
  "group" : "fans",
  "user" : [
    {
      "first" : "John",
      "last" :  "Smith"
    },
    {
      "first" : "Alice",
      "last" :  "White"
    }
  ]
}

PUT kpal/_doc/2
{
  "group" : "fans",
  "user" : [
    {
      "first" : "John",
      "last" :  "Smith"
    }
]
}

PUT kpal/_doc/3
{
  "group" : "fans",
  "user" : [
    {
      "first" : "John",
      "last" :  "Smith"
    },
    {
      "first" : "Alice",
      "last" :  "White"
    },
    {
      "first" : "Akbar",
      "last" :  "Jyothi"
    }
  ]
}

In my kibana dashboard version 6.6.0

Now i want to create a new field using script field called "firstname"

my script field:

doc["user.first].value[1]

getting shards are failed

also tried
doc['user.first'][0] ,
params['_source']['user.first'][0] but same error

reference used:

Nested field type | Elasticsearch Guide [8.11] | Elastic

1. here can we treat user.first behaves like array for each document ?

2. how can i access array of objects in the documents of an index ?

3. In saved search its showing objects in arrays are not well suported,how to resolve this issue ?

[lukas (Lukas Olson)]

If you'd just like to have a scripted field that gets only the first first name for each document, you can do so like this:

params._source.user[0].first

If you'd like to have a scripted field that gets all of the first names for each user in each document, you can do something like this:

def firstnames = [];
for (item in params._source.user) {
  firstnames.add(item.first);
}
return firstnames;

In general, having objects in arrays is not something that plays well with Kibana. If you can figure out a way to structure your data so that each document has a "group", "first", and "last" instead of an array of objects, it will be easier to use Kibana to visualize your data.

[PRUDHVI_CHOWDHARY_NE (Prudhvi Chowdhary Nekkalapudi)]

hello,

how to sort values of objects in an array in scripted field in kibana and get the lowesr one or greates one

[lukas (Lukas Olson)]

You can see an example here: Sorting comblex Array elements with Painless script