More on Vespa vs. Lucene/Elasticsearch

In a previous post, I took a look at the Vespa vs. Elasticsearch benchmark that the Vespa people run. The results made me want to dig a little deeper to see how Vespa and Lucene/Elasticsearch differ implemetation-wise. I took advantage of Vespa being open-source under the Apache License 2.0 to take a look at the source code. I found some similarities and differences that I expected, but also some…