Elasticsearch has been used as the search engine for Hatena Bookmark since 2014. It powers several key features including tag/title/content/URL search, related entries, issues, topics, and bookmark counting. Elasticsearch allows Hatena to provide powerful and flexible search across the social bookmarking platform.Read less
![Elasticsearch in hatena bookmark](https://cdn-ak-scissors.b.st-hatena.com/image/square/c6b57f24820377d132136f72bcf49ac15d1f5333/height=288;version=1;width=512/https%3A%2F%2Fcdn.slidesharecdn.com%2Fss_thumbnails%2Felasticsearchinhatenabookmark-150729070517-lva1-app6891-thumbnail.jpg%3Fwidth%3D640%26height%3D640%26fit%3Dbounds)