Export and make searchable your Facebook group
Install Coffeescript:
npm install -g coffee-script
Install node modules for project:
npm install
Get OAuth token from Facebook and add to fetch_posts.coffee. Simplest way I've found is from https://developers.facebook.com/tools/explorer?method=GET&path=338164739567715%2Ffeed
Setup Elasticsearch locally
Run coffee fetch_posts.coffee
As long as you leave the program running, it'll fetch new posts/comments every 30 minutes.
coffee query.coffee # all additional parameters become the search query.