Lucene and Elasticsearch are state of the art open-source products which power many search services around the world, including GitHub, LinkedIn, Twitter and many many others. But enabling efficient searches to yield relevant results is not an easy task. Every language has its special attributes, every corpus has its own characteristics, and every user expects to find the results most relevant to him.In this session we will explore one of the biggest challenges in the world of advanced full-text search - muli-lingual search. We will look at real-world pitfalls , and offer tools and solutions to overcome them.