[[query-dsl-script-query]]
=== Script query
++++
<titleabbrev>Script</titleabbrev>
++++

Filters documents based on a provided <<modules-scripting-using,script>>. The
`script` query is typically used in a <<query-filter-context,filter context>>.

WARNING: Using scripts can result in slower search speeds. See
<<scripts-and-search-speed>>.


[[script-query-ex-request]]
==== Example request

[source,console]
----
GET /_search
{
  "query": {
    "bool": {
      "filter": {
        "script": {
          "script": {
            "source": "doc['num1'].value > 1",
            "lang": "painless"
          }
        }
      }
    }
  }
}
----


[[script-top-level-params]]
==== Top-level parameters for `script`

`script`::
(Required, <<modules-scripting-using, script object>>) Contains a script to run
as a query. This script must return a boolean value, `true` or `false`.

[[script-query-notes]]
==== Notes

[[script-query-custom-params]]
===== Custom Parameters

Like <<query-filter-context,filters>>, scripts are cached for faster execution.
If you frequently change the arguments of a script, we recommend you store them
in the script's `params` parameter. For example:

[source,console]
----
GET /_search
{
  "query": {
    "bool": {
      "filter": {
        "script": {
          "script": {
            "source": "doc['num1'].value > params.param1",
            "lang": "painless",
            "params": {
              "param1": 5
            }
          }
        }
      }
    }
  }
}
----

===== Allow expensive queries
Script queries will not be executed if <<query-dsl-allow-expensive-queries, `search.allow_expensive_queries`>>
is set to false.