=== Scripting changes

==== Scripting syntax

The syntax for scripts has been made consistent across all APIs. The accepted
format is as follows:

Inline/Dynamic scripts::
+
--

[source,js]
---------------
"script": {
  "inline": "doc['foo'].value + val", <1>
  "lang":   "groovy", <2>
  "params": { "val": 3 } <3>
}
---------------
<1> The inline script to execute.
<2> The optional language of the script.
<3> Any named parameters.
--

Indexed scripts::
+
--
[source,js]
---------------
"script": {
  "id":     "my_script_id", <1>
  "lang":   "groovy", <2>
  "params": { "val": 3 } <3>
}
---------------
<1> The ID of the indexed script.
<2> The optional language of the script.
<3> Any named parameters.
--

File scripts::
+
--
[source,js]
---------------
"script": {
  "file":   "my_file", <1>
  "lang":   "groovy", <2>
  "params": { "val": 3 } <3>
}
---------------
<1> The filename of the script, without the `.lang` suffix.
<2> The optional language of the script.
<3> Any named parameters.
--

For example, an update request might look like this:

[source,js]
---------------
POST my_index/my_type/1/_update
{
  "script": {
    "inline": "ctx._source.count += val",
    "params": { "val": 3 }
  },
  "upsert": {
    "count": 0
  }
}
---------------

A short syntax exists for running inline scripts in the default scripting
language without any parameters:

[source,js]
----------------
GET _search
{
  "script_fields": {
    "concat_fields": {
      "script": "doc['one'].value + ' ' + doc['two'].value"
    }
  }
}
----------------

==== Scripting settings

The `script.disable_dynamic` node setting has been replaced by fine-grained
script settings described in <<migration-script-settings>>.

==== Groovy scripts sandbox

The Groovy sandbox and related settings have been removed. Groovy is now a
non-sandboxed scripting language, without any option to turn the sandbox on.

==== Plugins making use of scripts

Plugins that make use of scripts must register their own script context
through `ScriptModule`. Script contexts can be used as part of fine-grained
settings to enable/disable scripts selectively.
