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   $query as cts.query?,
   [$options as String[]],
   [$quality-weight as Number?],
   [$forest-ids as String[]]
) as Boolean


Returns true if any fragment is selected by the search, false if no fragments are selected. This can be used as a fast existence check.

$query A cts.query specifying the search to perform. If a string is entered, the string is treated as a cts.wordQuery of the specified string.
$options Options to this search. The default is (). See cts.search for details on the available options.
$quality-weight A document quality weight to use when computing scores. The default is 1.0.
$forest-ids A sequence of IDs of forests to which the search will be constrained. An null value means to search all forests in the database. The default is null.


  cts.exists(cts.wordQuery("something here"))
   => true

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