What is Apache Lucene Directory?

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Infinispan is including a highly scalable distributed Apache Lucene Directory implementation.   This directory closely mimicks the same semantics of the traditional filesystem and RAM-based directories, being able to work as a drop-in replacement for existing applications using Lucene and providing reliable index sharing and other features of Infinispan like node autodiscovery, automatic failover and rebalancing, transactional behaviour, and can be backed by traditional storage solutions as filesystem, databases or newest cloud store engines.