Solr 4.2.1 solr-core API

Apache Solr Search Server (Core Javadocs).

See:
Description

Packages

org.apache.solr	Commonly reused classes and interfaces (deprecated package, do not add new classes)
org.apache.solr.analysis	Factories and classes specific to text analysis and the creation of TokenStreams
org.apache.solr.client.solrj.embedded	SolrJ client implementations for embedded solr access.
org.apache.solr.cloud	Classes for dealing with ZooKeeper when operating in SolrCloud mode.
org.apache.solr.common	Commonly reused classes and interfaces (deprecated package, do not add new classes)
org.apache.solr.core	Core classes implementin Solr internals and the management of SolrCores
org.apache.solr.handler	Concrete implementations of SolrRequestHandler
org.apache.solr.handler.admin	SolrRequestHandler implementations for powering he Solr Admin UI
org.apache.solr.handler.component	SearchComponent implementations for use in SearchHandler
org.apache.solr.handler.loader	ContentStreamLoader implementations for use in ContentStreamHandlerBase implementations
org.apache.solr.highlight	SolrHighlighter API and related implementaions and utilities
org.apache.solr.internal.csv	Internal classes used for reading/writing CSV
org.apache.solr.internal.csv.writer	Internal classes used for reading/writing CSV
org.apache.solr.logging	APIs related to capturing log event info in the LoggingHandler
org.apache.solr.logging.jul	JUL based implementation of LogWatcher
org.apache.solr.parser	Solr native variant of the Lucene Classic QueryParser
org.apache.solr.request	APIs and classes for dealing with Solr requests
org.apache.solr.response	API and implementations of QueryResponseWriter for formating Solr request responses
org.apache.solr.response.transform	APIs and implementations of DocTransformer for modifying documents in Solr request responses
org.apache.solr.rest	Provides RESTful API access to the Solr Schema using Restlet.
org.apache.solr.schema	IndexSchema and FieldType implementations for powering schema.xml
org.apache.solr.search	APIs and classes for parsing and processing search requests
org.apache.solr.search.function	Solr implementations of ValueSource for function queries.
org.apache.solr.search.function.distance	Solr implementations of ValueSource for distance based function queries.
org.apache.solr.search.grouping	APIs and classes for implementing result grouping
org.apache.solr.search.grouping.collector	Grouping related Collectors
org.apache.solr.search.grouping.distributed	Internal APIs for distribute result grouping
org.apache.solr.search.grouping.distributed.command	Internal classes used to implement distributed result grouping
org.apache.solr.search.grouping.distributed.requestfactory	Internal classes used to implement distributed result grouping
org.apache.solr.search.grouping.distributed.responseprocessor	Internal classes used to implement distributed result grouping
org.apache.solr.search.grouping.distributed.shardresultserializer	Internal classes used to implement distributed result grouping
org.apache.solr.search.grouping.endresulttransformer	APIs and classes for transforming result grouping results into the appropriate response format
org.apache.solr.search.similarities	Factories for various built-in Lucene ranking models.
org.apache.solr.servlet	Servlet related classes for powering the Solr HTTP API
org.apache.solr.servlet.cache	Caching related classes used in the Solr HTTP API
org.apache.solr.spelling	APIs and classes used by the SpellCheckComponent
org.apache.solr.spelling.suggest	APIs and classes used by the SpellCheckComponent
org.apache.solr.spelling.suggest.fst	Factories for FST and Analyzing based Suggesters
org.apache.solr.spelling.suggest.jaspell	Factories for JaSpell based Suggesters
org.apache.solr.spelling.suggest.tst	Factories for TST based Suggesters
org.apache.solr.update	APIs and classes for managing index updates
org.apache.solr.update.processor	UpdateRequestProcessorFactory APIs and implementations for use in UpdateRequestProcessorChains
org.apache.solr.util	Common utility classes used throughout Solr
org.apache.solr.util.plugin	Common APIs related to implementing Solr plugins
org.apache.solr.util.stats	Utilities for collecting statistics
org.apache.solr.util.xslt	XSLT related utilities (deprecated package, do not add new classes)

Apache Solr Search Server (Core Javadocs).