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Apache Solr Reference Guide

About This Guide
Getting Started
Deployment and Operations
Using the Solr Administration User Interface
Documents, Fields, and Schema Design
Understanding Analyzers, Tokenizers, and Filters
Indexing and Basic Data Operations
Searching
Streaming Expressions
SolrCloud
Legacy Scaling and Distribution
Circuit Breakers
Solr Plugins
The Well-Configured Solr Instance
Monitoring Solr
Securing Solr
Client APIs
Further Assistance
Solr Glossary
Errata
How to Contribute to Solr Documentation

Solr Website
Other Formats
- Archived PDFs
- Other Versions Online
Solr Resources

Welcome to Apache Solr™, the open source solution for search and analytics.

Solr is the fast open source search platform built on Apache Lucene™ that provides scalable indexing and search, as well as faceting, hit highlighting and advanced analysis/tokenization capabilities. Solr and Lucene are managed by the Apache Software Foundation.

This Reference Guide is the official Solr documentation, written and published by Lucene/Solr committers.

The Guide includes the following sections:

Getting Started with Solr

The Getting Started section guides you through the installation and setup of Solr. A detailed tutorial for first-time users shows many of Solr’s features.

Using the Solr Administration User Interface: This section introduces the Web-based interface for administering Solr. From your browser you can view configuration files, submit queries, view logfile settings and Java environment settings, and monitor and control distributed configurations.

Deploying Solr

Deployment and Operations: Once you have Solr configured, you want to deploy it to production and keep it up to date. This section includes information about how to take Solr to production, run it in HDFS or AWS, and information about upgrades and managing Solr from the command line.

Monitoring Solr: Solr includes options for keeping an eye on the performance of your Solr cluster with the web-based administration console, through the command line interface, or using REST APIs.

Indexing Documents

Indexing and Basic Data Operations: This section describes the indexing process and basic index operations, such as commit, optimize, and rollback.

Documents, Fields, and Schema Design: This section describes how Solr organizes data in the index. It explains how a Solr schema defines the fields and field types which Solr uses to organize data within the document files it indexes.

Understanding Analyzers, Tokenizers, and Filters: This section explains how Solr prepares text for indexing and searching. Analyzers parse text and produce a stream of tokens, lexical units used for indexing and searching. Tokenizers break field data down into tokens. Filters perform other transformational or selective work on token streams.

Searching Documents

Searching: This section presents an overview of the search process in Solr. It describes the main components used in searches, including request handlers, query parsers, and response writers. It lists the query parameters that can be passed to Solr, and it describes features such as boosting and faceting, which can be used to fine-tune search results.

Streaming Expressions: A stream processing language for Solr, with a suite of functions to perform many types of queries and parallel execution tasks.

Client APIs: This section tells you how to access Solr through various client APIs, including JavaScript, JSON, and Ruby.

Scaling Solr

SolrCloud: This section describes SolrCloud, which provides comprehensive distributed capabilities.

Legacy Scaling and Distribution: This section tells you how to grow a Solr distribution by dividing a large index into sections called shards, which are then distributed across multiple servers, or by replicating a single index across multiple services.

Circuit Breakers: This section talks about circuit breakers, a way of allowing a higher stability of Solr nodes and increased service level guarantees of requests that are accepted by Solr.

Advanced Configuration

Securing Solr: When planning how to secure Solr, you should consider which of the available features or approaches are right for you.

The Well-Configured Solr Instance: This section discusses performance tuning for Solr. It begins with an overview of the solrconfig.xml file, then tells you how to configure cores with solr.xml, how to configure the Lucene index writer, and more.

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