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[[query-dsl-missing-filter]]
=== Missing Filter
Filters documents where a specific field has no value in them.
[source,js]
--------------------------------------------------
{
"constant_score" : {
"filter" : {
"missing" : { "field" : "user" }
}
}
}
--------------------------------------------------
By default, the filter will only find "missing" fields, i.e., fields
that have no values. It can be configured also to find fields with an
explicit `null_value` mapped for them. Here is an example that will both
find missing field that don't exists (`existence` set to `true`), or
have null values (`null_value` set to `true`).
[source,js]
--------------------------------------------------
{
"constant_score" : {
"filter" : {
"missing" : {
"field" : "user",
"existence" : true,
"null_value" : true
}
}
}
}
--------------------------------------------------
[float]
==== Caching
The result of the filter is always cached.
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