*HTTP request processing for indexing and querying documents.
*Several caches for faster query responses.
*A web-based administrative interface including:
*Runtime performance statistics including cache
*A query form to search the index.
*A schema browser with histograms of popular terms along with some statistics.
*Detailed breakdown of scoring mathematics and text
analysis phases.
*Configuration files for the schema and the server itself (in XML).
*Solr adds to Lucene's text analysis library and makes it configurable through XML.
*Introduces the notion of a field type (this is important yet surprisingly not in Lucene). Types are present for dates and special sorting concerns.
*The disjunction-max query handler is more usable by end user queries and applications than Lucene's underlying raw queries.
*Faceting of query results.
*A spell check plugin used for making alternative query suggestions (that is, "did you mean ___")
*A more like this plugin to list documents that are similar to a
*chosen document.
*A distributed Solr server model with supporting scripts to support larger scale deployments.
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