Apache - Solr (Index and Search)

> (Natural|Human) Language - Text (Mining|Analytics)

1 - About

Apache Solr is a search platform built on Apache Lucene.

Build on Java, License onder Apache 2

Data may be stored in HDFS in Hadoop

elasticsearch is built on top of it.

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3 - API

SolrJ is an API that makes it easy for applications written in Java

4 - Documentation / Reference