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[[mapping-field-names-field]]
=== `_field_names` field
The `_field_names` field indexes the names of every field in a document that
contains any value other than `null`. This field is used by the
<<query-dsl-exists-query,`exists`>> query to find documents that
either have or don't have any non-+null+ value for a particular field.
The value of the `_field_names` field is accessible in queries:
[source,js]
--------------------------
# Example documents
PUT my_index/my_type/1
{
"title": "This is a document"
}
PUT my_index/my_type/2?refresh=true
{
"title": "This is another document",
"body": "This document has a body"
}
GET my_index/_search
{
"query": {
"terms": {
"_field_names": [ "title" ] <1>
}
}
}
--------------------------
// CONSOLE
<1> Querying on the `_field_names` field (also see the <<query-dsl-exists-query,`exists`>> query)
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