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2.2.1.1. Lucene In this mode, all index update operations applied on a given node (JVM) will be executed to the Lucene directories (through the directory providers) by the same node. This mode is typically used in non clustered environment or in clustered environments where the directory store is shared. Lucene back end configuration. This mode targets non clustered applications, or clustered applications where the Directory is taking care of the locking strategy. The main advantage is simplicity and immediate visibility of the changes in Lucene queries (a requirement in some applications).