picture

https://500px.com/deepskycolors

http://nlp.stanford.edu/IR-book/pdf/irbookonlinereading.pdf

http://en.wikipedia.org/wiki/Information_retrieval

http://lucene.apache.org/core/

http://lucene.apache.org/core/3_0_3/api/core/org/apache/lucene/index/IndexWriter.html

http://en.wikipedia.org/wiki/Search_engine_indexing

http://stackoverflow.com/questions/7865816/search-engine-algorithm-in-java?rq=1

http://lucene.apache.org/solr/

http://stackoverflow.com/questions/1472341/java-from-lucene-hits-to-original-objects?rq=1

http://www.compass-project.org/docs/latest/reference/html/core-introduction.html#core-introduction-overview