Advanced Search with Lucene

common search requests
	advanced query syntax
	high-performance, scalable
	ability to add custom facets
	multisite search, content not shared, but user may be
	managed through Drupal admin interface

core search
	pros
		good api...mostly
		pure php
		works out of the box
	cons
		elementary query syntzx
		not scalable
			db heavy
		no good method to alter query
		adding facets unweildy
		
Lucene
	open source text search library
	written in java
	high-performance
	full featured
	supported by apache 
	capabilities
		ranked results (most relevant returned first)
		boolean and, and not, or
		fielded data search
			eg. content, author, add custom fields
		powerful query types
			wildcard
				regex search, eg te?t -->text, test
				not in core or solr
			fuzzy
			range
			boost
				force term up the result list
		field and term grouping
			eg "drupal and php
		index on filesystem

Search Lucene API
	paging set in the module
	goals
		integrate lucene into drupal, including api and hooks
		implement and extend core search api
		no external services
		native php
	"decaffeinated" by zend framework
		zf zend_search_lucene component
			oo php port of lucene
			indexes binary compatible with java; can move indexes back and forth between java and php
		stripped down version of required framework
	installation
		download search lucene api from drupal
		download zf components from sourceforge.net (readme in drupal mod has location)
		enable module
		run cron
		be happy
	configuring sl api
		hijack core searchh box
			all search box submissions go through slapi
		error handling
			how to andle exceptions
			can display generic error message if someting goes wrong
		search lucene content
			sub module
			settings
				index path
				update index via cron
				search page settings
					menu name
				caching
				faceting
					author
					content type
					create/modify date
					taxonomy
					custom
	comparison with other engines
		slower page loads than search and solr
		zf component can be memory intensive
		indexing faster than solr but slower than search
	performance settings
		result caching
			cache cleared when content added ro removed
		result set limit
			global setting
			only calculates scores for first n nodes
		index optimization
			consolidates files in index
	drush aware
	
maintaining lucene with drush
	update or optimize index
	get size of index
	wipe index
	clear search results cache
	
UI for weighting/boosting not currently in api but is part of lucene base