$query matches
any document fragment. When searching documents, document-properties, or
document-locks, cts:document-fragment-query provides a
convenient way to additionally constrain the search against any document
fragment.
A query that uses cts:document-fragment-query allows you
to cross fragment boundaries in a cts:and-query, as shown in the
second example below.
cts:search(
cts.documentFragmentQuery(
cts.wordQuery("hello")));
=> All documents that contain the word "hello".