Implementing full text search in Mongo

Many of us (I won't be wrong to say all of us) use Google every day to search content on the web. To explain in short: the text that we provide in the text box on Google's page is used to search the pages on the web it has indexed. The search results are then returned to us in some order determined by Google's page rank algorithm. We might want to have a similar functionality in our database that lets us search for some text content and give the corresponding search results. Note that this text search is not same as finding the text as part of the sentence, which can easily be done using regex. It goes way beyond that and can be used to get results that contain the same word, a similar sounding word, have a similar base word, or even a synonym in the actual sentence.

Since MongoDB Version 2.4, text indexes have been introduced, which let us create text indexes on a particular field in the document and enable text search on those words. In this recipe...