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Packages 
Package Description
org.apache.lucene
Top-level package.
org.apache.lucene.analysis
Text analysis.
org.apache.lucene.analysis.ar
Analyzer for Arabic.
org.apache.lucene.analysis.bg
Analyzer for Bulgarian.
org.apache.lucene.analysis.bn
Analyzer for Bengali Language.
org.apache.lucene.analysis.br
Analyzer for Brazilian Portuguese.
org.apache.lucene.analysis.ca
Analyzer for Catalan.
org.apache.lucene.analysis.charfilter
Normalization of text before the tokenizer.
org.apache.lucene.analysis.cjk
Analyzer for Chinese, Japanese, and Korean, which indexes bigrams.
org.apache.lucene.analysis.ckb
Analyzer for Sorani Kurdish.
org.apache.lucene.analysis.cn.smart
Analyzer for Simplified Chinese, which indexes words.
org.apache.lucene.analysis.cn.smart.hhmm
SmartChineseAnalyzer Hidden Markov Model package.
org.apache.lucene.analysis.commongrams
Construct n-grams for frequently occurring terms and phrases.
org.apache.lucene.analysis.compound
A filter that decomposes compound words you find in many Germanic languages into the word parts.
org.apache.lucene.analysis.compound.hyphenation
Hyphenation code for the CompoundWordTokenFilter.
org.apache.lucene.analysis.core
Basic, general-purpose analysis components.
org.apache.lucene.analysis.custom
A general-purpose Analyzer that can be created with a builder-style API.
org.apache.lucene.analysis.cz
Analyzer for Czech.
org.apache.lucene.analysis.da
Analyzer for Danish.
org.apache.lucene.analysis.de
Analyzer for German.
org.apache.lucene.analysis.el
Analyzer for Greek.
org.apache.lucene.analysis.en
Analyzer for English.
org.apache.lucene.analysis.es
Analyzer for Spanish.
org.apache.lucene.analysis.eu
Analyzer for Basque.
org.apache.lucene.analysis.fa
Analyzer for Persian.
org.apache.lucene.analysis.fi
Analyzer for Finnish.
org.apache.lucene.analysis.fr
Analyzer for French.
org.apache.lucene.analysis.ga
Analyzer for Irish.
org.apache.lucene.analysis.gl
Analyzer for Galician.
org.apache.lucene.analysis.hi
Analyzer for Hindi.
org.apache.lucene.analysis.hu
Analyzer for Hungarian.
org.apache.lucene.analysis.hunspell
Stemming TokenFilter using a Java implementation of the Hunspell stemming algorithm.
org.apache.lucene.analysis.hy
Analyzer for Armenian.
org.apache.lucene.analysis.id
Analyzer for Indonesian.
org.apache.lucene.analysis.in
Analyzer for Indian languages.
org.apache.lucene.analysis.it
Analyzer for Italian.
org.apache.lucene.analysis.lt
Analyzer for Lithuanian.
org.apache.lucene.analysis.lv
Analyzer for Latvian.
org.apache.lucene.analysis.minhash
MinHash filtering (for LSH).
org.apache.lucene.analysis.miscellaneous
Miscellaneous Tokenstreams.
org.apache.lucene.analysis.ngram
Character n-gram tokenizers and filters.
org.apache.lucene.analysis.nl
Analyzer for Dutch.
org.apache.lucene.analysis.no
Analyzer for Norwegian.
org.apache.lucene.analysis.path
Analysis components for path-like strings such as filenames.
org.apache.lucene.analysis.pattern
Set of components for pattern-based (regex) analysis.
org.apache.lucene.analysis.payloads
Provides various convenience classes for creating payloads on Tokens.
org.apache.lucene.analysis.pt
Analyzer for Portuguese.
org.apache.lucene.analysis.query
Automatically filter high-frequency stopwords.
org.apache.lucene.analysis.reverse
Filter to reverse token text.
org.apache.lucene.analysis.ro
Analyzer for Romanian.
org.apache.lucene.analysis.ru
Analyzer for Russian.
org.apache.lucene.analysis.shingle
Word n-gram filters.
org.apache.lucene.analysis.sinks
org.apache.lucene.analysis.snowball
TokenFilter and Analyzer implementations that use Snowball stemmers.
org.apache.lucene.analysis.sr
Analyzer for Serbian.
org.apache.lucene.analysis.standard
Fast, general-purpose grammar-based tokenizer StandardTokenizer implements the Word Break rules from the Unicode Text Segmentation algorithm, as specified in Unicode Standard Annex #29.
org.apache.lucene.analysis.sv
Analyzer for Swedish.
org.apache.lucene.analysis.synonym
Analysis components for Synonyms.
org.apache.lucene.analysis.th
Analyzer for Thai.
org.apache.lucene.analysis.tokenattributes
General-purpose attributes for text analysis.
org.apache.lucene.analysis.tr
Analyzer for Turkish.
org.apache.lucene.analysis.util
Utility functions for text analysis.
org.apache.lucene.analysis.wikipedia
Tokenizer that is aware of Wikipedia syntax.
org.apache.lucene.codecs
Codecs API: API for customization of the encoding and structure of the index.
org.apache.lucene.codecs.blocktree
BlockTree terms dictionary.
org.apache.lucene.codecs.compressing
StoredFieldsFormat that allows cross-document and cross-field compression of stored fields.
org.apache.lucene.codecs.idversion
A primary-key postings format that associates a version (long) with each term and can provide fail-fast lookups by ID and version.
org.apache.lucene.codecs.lucene50
Components from the Lucene 5.0 index format See org.apache.lucene.codecs.lucene80 for an overview of the index format.
org.apache.lucene.codecs.lucene60
Components from the Lucene 6.0 index format.
org.apache.lucene.codecs.lucene70
Components from the Lucene 7.0 index format.
org.apache.lucene.codecs.lucene80
Lucene 8.0 file format.
org.apache.lucene.codecs.perfield
Postings format that can delegate to different formats per-field.
org.apache.lucene.collation
Unicode collation support.
org.apache.lucene.collation.tokenattributes
Custom AttributeImpl for indexing collation keys as index terms.
org.apache.lucene.document
The logical representation of a Document for indexing and searching.
org.apache.lucene.geo
Geospatial Utility Implementations for Lucene Core
org.apache.lucene.index
Code to maintain and access indices.
org.apache.lucene.index.memory
High-performance single-document main memory Apache Lucene fulltext search index.
org.apache.lucene.misc
Miscellaneous index tools.
org.apache.lucene.payloads
Experimental classes for interacting with payloads
org.apache.lucene.queries
Filters and Queries that add to core Lucene.
org.apache.lucene.queries.function
Queries that compute score based upon a function.
org.apache.lucene.queries.function.docvalues
FunctionValues for different data types.
org.apache.lucene.queries.function.valuesource
A variety of functions to use with FunctionQuery.
org.apache.lucene.queries.mlt
Document similarity query generators.
org.apache.lucene.queries.payloads
The payloads package provides Query mechanisms for finding and using payloads.
org.apache.lucene.queryparser.classic
A simple query parser implemented with JavaCC.
org.apache.lucene.queryparser.complexPhrase
QueryParser which permits complex phrase query syntax eg "(john jon jonathan~) peters*"
org.apache.lucene.queryparser.ext
Extendable QueryParser provides a simple and flexible extension mechanism by overloading query field names.
org.apache.lucene.queryparser.flexible.core
Core classes of the flexible query parser framework.
org.apache.lucene.queryparser.flexible.core.builders
Necessary classes to implement query builders.
org.apache.lucene.queryparser.flexible.core.config
Base classes used to configure the query processing.
org.apache.lucene.queryparser.flexible.core.messages
Messages usually used by query parser implementations.
org.apache.lucene.queryparser.flexible.core.nodes
Query nodes commonly used by query parser implementations.
org.apache.lucene.queryparser.flexible.core.parser
Necessary interfaces to implement text parsers.
org.apache.lucene.queryparser.flexible.core.processors
Interfaces and implementations used by query node processors
org.apache.lucene.queryparser.flexible.core.util
Utility classes to used with the Query Parser.
org.apache.lucene.queryparser.flexible.messages
For Native Language Support (NLS), system of software internationalization.
org.apache.lucene.queryparser.flexible.precedence
Precedence Query Parser Implementation
org.apache.lucene.queryparser.flexible.precedence.processors
Processors used by Precedence Query Parser
org.apache.lucene.queryparser.flexible.standard
Implementation of the Lucene classic query parser using the flexible query parser frameworks
org.apache.lucene.queryparser.flexible.standard.builders
Standard Lucene Query Node Builders.
org.apache.lucene.queryparser.flexible.standard.config
Standard Lucene Query Configuration.
org.apache.lucene.queryparser.flexible.standard.nodes
Standard Lucene Query Nodes.
org.apache.lucene.queryparser.flexible.standard.parser
Lucene Query Parser
org.apache.lucene.queryparser.flexible.standard.processors
Lucene Query Node Processors.
org.apache.lucene.queryparser.simple
A simple query parser for human-entered queries.
org.apache.lucene.queryparser.surround.parser
This package contains the QueryParser.jj source file for the Surround parser.
org.apache.lucene.queryparser.surround.query
This package contains SrndQuery and its subclasses.
org.apache.lucene.queryparser.xml
Parser that produces Lucene Query objects from XML streams.
org.apache.lucene.queryparser.xml.builders
XML Parser factories for different Lucene Query/Filters.
org.apache.lucene.sandbox.queries
Additional queries (some may have caveats or limitations)
org.apache.lucene.search
Code to search indices.
org.apache.lucene.search.grouping
Grouping.
org.apache.lucene.search.highlight
Highlighting search terms.
org.apache.lucene.search.intervals
Intervals queries
org.apache.lucene.search.join
Support for index-time and query-time joins.
org.apache.lucene.search.similarities
This package contains the various ranking models that can be used in Lucene.
org.apache.lucene.search.similarity
Misc similarity implementations.
org.apache.lucene.search.spans
The calculus of spans.
org.apache.lucene.search.uhighlight
The UnifiedHighlighter -- a flexible highlighter that can get offsets from postings, term vectors, or analysis.
org.apache.lucene.search.vectorhighlight
Another highlighter implementation based on term vectors.
org.apache.lucene.store
Binary i/o API, used for all index data.
org.apache.lucene.util
Some utility classes.
org.apache.lucene.util.automaton
Finite-state automaton for regular expressions.
org.apache.lucene.util.bkd
Block KD-tree, implementing the generic spatial data structure described in this paper.
org.apache.lucene.util.fst
Finite state transducers
org.apache.lucene.util.graph
Utility classes for working with token streams as graphs.
org.apache.lucene.util.mutable
Comparable object wrappers
org.apache.lucene.util.packed
Packed integer arrays and streams.
org.tartarus.snowball
Snowball stemmer API
org.tartarus.snowball.ext
Autogenerated snowball stemmer implementations.
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