EXISTS
The EXISTS
field specifier (case sensitive) allows you to find documents that contain a specified field even if this field contains no value.
NOTE: You can optimize the field specifier speed by restricting the field to the
Format
FieldText=EXISTS{}:yourFields
yourFields
|
One or more fields. A document returns only if it contains one of these fields (even if the field is empty). Separate multiple fields with colons (: ). There must be no space before or after a colon. |
Example
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.