Mongo Connector is an open-source tool that allows for the synchronization of data between MongoDB and Elasticsearch, enabling features like real-time search and fuzzy matching. It was initially released in 2012 but has since improved significantly, providing stability and new features such as fault tolerance and safe encoding of data types. Mongo Connector can stream changes from one replica set primary to another, simulating a "multi-master" cluster, and replicate operations from MongoDB to Elasticsearch. The tool allows for the replication of documents with their content, including text fields, and supports fuzzy matching using parameters like fuzziness and prefix_length. It also enables real-time updates and deletes in both systems, maintaining consistency between them, making it an essential tool for applications requiring near-real-time search capabilities.