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Dynamically computed values to sort/facet/search on based on a pluggable grammar.

There is a newer version: 10.1.0

Apache Lucene Expressions Module 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: {@link org.apache.lucene.expressions} - The abstractions and simple utilities for common operations like sorting on an expression {@link org.apache.lucene.expressions.js} - A compiler for a subset of JavaScript expressions For sample code showing how to use the API, see {@link org.apache.lucene.expressions.Expression}.