![]() Pluggable query handlers and extensible XML data format.Date Math - specify dates relative to "NOW" in queries and updates.Function Query - influence the score by a function of a field's numeric value or ordinal.Constant scoring range and prefix queries - no idf, coord, or lengthNorm factors, and no restriction on the number of terms the query matches.HTTP interface with configurable response formats (XML/XSLT, JSON, Python, Ruby).Many additional text analysis components including word splitting, regex and sounds-like filters.External file-based configuration of stopword lists, synonym lists, and protected word lists.Explicit types eliminates the need for guessing types of fields.Dynamic Fields enables on-the-fly addition of new fields.Defines the field types and fields of documents.Solr's feature set is broken down into several subsystems: Community reports have been good, with users reporting indices with several million documents performing quite well. It is currently used for search applications on several high-traffic public websites. Solr was initially developed at CNET Networks and was donated to the Apache Software Foundation in 2006. Solr also provides a master-slave index replication mechanism to allow query load to be distributed in a large-scale environment. Users interact with Solr via an HTTP interface, submitting content for indexing and making queries using XML documents and HTTP GET parameters. Apache Solr is a Lucene-based enterprise search server that delivers out-of-the-box indexing and query capabilities in a portable war file.
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