Open Source, Distributed, RESTful Search Engine
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.
Free Elasticsearch security plugin and Kibana security plugin: super-easy Kibana multi-tenancy, Encryption, Authentication, Authorization, Auditing
Plugin to integrate Learning to Rank (aka machine learning for better relevance) with Elasticsearch
Elasticsearch real-time search and analytics natively integrated with Hadoop
Spring factories for elasticsearch
A set of classes for using Elasticsearch in a Dropwizard service.
Elasticsearch Beyonder project gives some features beyond elasticsearch itself.
Morphological Analysis Plugin for ElasticSearch