Fields that Do Not Exist or Contain No Value
EMPTY
The EMPTY
field specifier (case sensitive) allows you to find documents in which a specified field does not exist or contains no value.
FieldText=EMPTY{}:yourFields
where:
yourFields
|
is one or more fields. A document returns only if it does not contain any of these fields or if these fields are empty. To specify multiple fields, separate them with colons (there must be no space before or after a colon). |
Examples:
FieldText=EMPTY{}:ID
A document must not contain an ID
field, or must hold no value in its ID
field, to return.
FieldText=EMPTY{}:ID:Name
A document must not contain an ID
or Name
field, or must hold no value in its ID
or Name
field, to return.