Lucene 官方的文档很少，只提供了 Java Docs，建议优先从中获取资料，在 Java Docs 里面找不到或者很难找到的资料时，才使用 Web 搜素引擎进行搜索。

源码包里面对应的 Java Docs 目录为：

# Java Docs 入口文档
lucene-9.4.1-src/lucene-9.4.1/lucene/documentation/src/markdown/index.template.md
#

Apache Lucene™ 9.4.1 Documentation

Lucene is a Java full-text search engine. Lucene is not a complete application, but rather a code library and API that can easily be used to add search capabilities to applications.

This is the official documentation for Apache Lucene 9.4.1. Additional documentation is available in the Wiki.

Getting Started

The following section is intended as a "getting started" guide. It has three
audiences: first-time users looking to install Apache Lucene in their
application; developers looking to modify or base the applications they develop
on Lucene; and developers looking to become involved in and contribute to the
development of Lucene. The goal is to help you "get started". It does not go into great depth
on some of the conceptual or inner details of Lucene:

Lucene demo, its usage, and sources:
Tutorial and walk-through of the command-line Lucene demo.
Introduction to Lucene's APIs:
High-level summary of the different Lucene packages. </li>
Analysis overview:
Introduction to Lucene's analysis API. See also the
TokenStream consumer workflow.

Reference Documents

Changes: List of changes in this release.
System Requirements: Minimum and supported Java versions.
Migration Guide: What changed in Lucene ${project.majorVersion()}; how to migrate code from Lucene$ {project.majorVersion()-1}.x.
JRE Version Migration: Information about upgrading between major JRE versions.
File Formats:
Guide to the supported index format used by Lucene. This can be customized by using
an alternate codec.
Search and Scoring in Lucene:
Introduction to how Lucene scores documents.
Classic Scoring Formula:
Formula of Lucene's classic Vector Space implementation
(look here for other models).
Classic QueryParser Syntax:
Overview of the Classic QueryParser's syntax and features.

API Javadocs

core: Lucene core library
analysis-common: Analyzers for indexing content in different languages and domains
analysis-icu: Analysis integration with ICU (International Components for Unicode)
analysis-kuromoji: Japanese Morphological Analyzer
analysis-morfologik: Analyzer for dictionary stemming, built-in Polish dictionary
analysis-nori: Korean Morphological Analyzer
analysis-opennlp: OpenNLP Library Integration
analysis-phonetic: Analyzer for indexing phonetic signatures (for sounds-alike search)
analysis-smartcn: Analyzer for indexing Chinese
analysis-stempel: Analyzer for indexing Polish
backward-codecs: Codecs for older versions of Lucene
benchmark: Lucene benchmarking module
classification: Classification module for Lucene
codecs: Lucene codecs and postings formats
demo: Simple example code for Apache Lucene
expressions: Dynamically computed values to sort/facet/search on based on a pluggable grammar
facet: Faceted indexing and search capabilities
grouping: Collectors for grouping search results
highlighter: Highlights search keywords in results
join: Index-time and Query-time joins for normalized content
memory: Single-document in-memory index implementation
misc: Index tools and other miscellaneous code
monitor: Reverse-search implementation for monitoring and classification
queries: Filters and Queries that add to core Lucene
queryparser: Query parsers and parsing framework
replicator: Lucene index files replication utility
sandbox: Various third party contributions and new ideas
spatial-extras: Geospatial search
spatial3d: 3D spatial planar geometry APIs
suggest: Auto-suggest and Spellchecking support
test-framework: Framework for testing Lucene-based applications

Tools

Luke - Lucene Toolbox GUI tool: A Swing app for browsing documents, indexed terms and posting lists, searching an index, and so on. Type "/path/to/lucene-9.4.1/bin/luke.{sh|cmd}" to launch Luke.

Apache Lucene™ 9.4.1 Documentation