You can collect information from maps with topics that contain the text you want.
MultiMaps recognizes instructions you can enable through the macro language operators topicname and topictext.
For example, to collect topics containing text meeting, type this code in the collection topic notes: topictext:contains:meeting
The Data Collection engine now understands that you want to collect topics that contain the word meeting.
By default, the search is case-insensitive. Apply the casesensitive macro language operator if you want it to recognise the case of a letters.
See here for the fastest way to collect topics with the required topic text.