How to invoke filter:topic.search ?

[SuperMike]

I am working on a search plugin.

There're two filters available for topic & post :

• filter:search.query

plugin.search = function(data, callback) {
    winston.info('enter search')
	winston.info(data)
	return callback(null, []);
};

• filter:topic.search

plugin.searchTopic = function(data, callback) {
    winston.info('enter topic search')
	winston.info(data)
	return callback(null, []);
};

now I can see the log in search after I search something, as well as advanced search. But searchTopicnever show.

Can someone tell me how to invoke this filter ?