Better late then never, here is the screencast of my presentation Big Search for Big Data that I gave at LuceneRevolution. Its a story of the mistakes and victories we had in a major search project we did for a Federal customer.
Big Search for Big Data: The Screencast
More blog articles:
How Amazon forked the open source Elasticsearch project in reaction to Elastic's mixing of open source and commercial code, and...
OSC have contributed to a free report on search with a chapter on The Rise of the Relevance Engineer
Feature blow-by-blows of heavily configurable open source search engines don't make much sense.