The Expressions Module for Apache Lucene
The expressions module is new to Lucene 4.6. It provides an API for dynamically computing per-document values based on string expressions.
The module is organized in two sections:
org.apache.lucene.expressions- The abstractions and simple utilities for common operations like sorting on an expressionorg.apache.lucene.expressions.js- A compiler for a subset of JavaScript expressions
    For sample code showing how to use the API, see Expression.
  
| Package | Description | 
|---|---|
| org.apache.lucene.expressions | 
 Expressions. 
 | 
| org.apache.lucene.expressions.js | 
 Javascript expressions. 
 |