Specific Fields, Irrespective of their Value
EXISTS
The EXISTS
field specifier (case sensitive) allows you to find documents that contain a specified field even if this field contains no value.
FieldText=EXISTS{}:yourFields
where:
yourFields
|
is one or more fields. A document returns only if it contains one of these fields (even if the field is empty). To specify multiple fields, separate them with colons (there must be no space before or after a colon). |
Examples:
FieldText=EXISTS{}:ID
A document must contain an ID
field to return.
FieldText=EXISTS{}:ID:NAME
A document must contain an ID
or NAME
field (or both) to return.