ElasticSearch (5) Excellent Blog or Example
Data Visualization on ES
http://www.elasticsearch.org/blog/2011/05/13/data-visualization-with-elasticsearch-and-protovis.html
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Search Engine Indexing
http://en.wikipedia.org/wiki/Index_(search_engine)#Inverted_indices
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Faceted Search
http://en.wikipedia.org/wiki/Faceted_search
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Information Filtering and Information Retrieval?
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.104.7500
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