Elasticsearch : Set the number of the elements of an array in a field

Question

I'm trying to store the number of elements of an array into a field with an update. (updating the record with the count of the array).

Like for example

{
  array = [ { "a" : "b" }, { "c" : "d" } ]
  nb_elements = 2
}

I have tried an update with the following script

{
  "script" : "ctx._source.nb_elements= ctx._source.array.values.length"
}

But it don't work. I also tried :

{
"script" : "ctx._source.nb_elements = count",
"params" : {
   "count" : ctx._source.array.values.length
   }
}

But i wasn't more successfull.

Does anybody know if this is possible and if, how to do it ?

moliware · Accepted Answer · 2015-06-27 16:49:18Z

1

First of all you need to enable dynamic scripting by adding script.disable_dynamic: false to your config file.

Secondly, I'm supposing that you are using groovy (It's the default scripting language from 1.4).

Using the update api with this script should work:

{
  "script": "ctx._source.nb_elements=ctx._source.array.size"
}

answered Jun 27, 2015 at 16:49

moliware

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4 Comments

Cédric ZUGER Over a year ago

It works , thank you. Where did you find this information ?

moliware Over a year ago

I've put some links to the documentation in the answer :) I've also checked this answer: stackoverflow.com/questions/24711168/…

Cédric ZUGER Over a year ago

Ok, for reenabling the dynamic scripting, but where did you find that i had to use size rather than count or length (i can find nothing about that).

moliware Over a year ago

Well, I have no idea about groovy, but I know it is a JVM language and collection classes tend to have size method in Java. So, it was a bit of intuition. If you have doubts about the language you can check its documentation: groovy-lang.org/documentation.html

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