$flags: a comma-delimited list of strings representing the options used. May
include: utf8 (this will always be set for new revisions); gzip; external.
-'SearchUpdate': Prior to search update completion.
+'SearchUpdate': Prior to search update completion. Return false to stop any
+further text/content processing
$id : Page id
-$namespace : Page namespace
-$title : Page title
+$title : Title object
$text : Current text being indexed
+$content : Content object for text being indexed.
'SearchGetNearMatchBefore': Perform exact-title-matches in "go" searches before
the normal operations.