For background information about the Lucene index, see Understanding Indexing in Advanced Installation and Reconfiguration in the Kablink Vibe OnPrem 3 Installation Guide.
Understanding Indexing
Advanced Installation and Reconfiguration
Section 18.1, Starting and Stopping the Lucene Index Server
Section 18.2, Changing Your Lucene Configuration
Section 18.3, Optimizing the Lucene Index
Section 18.4, Rebuilding the Lucene Index