Java / ElasticSearch
Free and Open, Distributed, RESTful Search Engine
The IK Analysis plugin integrates Lucene IK analyzer into elasticsearch, support customized dictionary.
This Pinyin Analysis plugin is used to do conversion between Chinese characters and Pinyin.
Plugin to integrate Learning to Rank (aka machine learning for better relevance) with Elasticsearch
Provide support to increase developer productivity in Java when using Elasticsearch. Uses familiar Spring concepts such as a template classes for core API usage and lightweight repository style data access.
Elasticsearch real-time search and analytics natively integrated with Hadoop
Elassandra = Elasticsearch + Apache Cassandra
Free Elasticsearch security plugin and Kibana security plugin: super-easy Kibana multi-tenancy, Encryption, Authentication, Authorization, Auditing