In the stemming section of mapping & analysis, we refer to a stemmed language called "Lovins" and make an educated guess that this is the language they speak in Lovinia. Lovinia is not a country and Lovins is actually an English-language stemmer that enhances the Snowball stemmer. Using the Lovins option will work with English alone.
http://snowball.tartarus.org/algorithms/lovins/festschrift.html
In response to a performance optimization question during Q&A, we explain that the mlockall option reserves the full amount of heap on startup. While this is true, the option also ensures that all the allocated memory is never swapped or paged.
http://linux.die.net/man/2/mlockall
We also refer to two term filter cache settings, plain and bool. While both do in fact construct a bitset of documents matching the filter, plain will construct and cache a bitset for documents matching all terms and bool will construct and cache bitset for each term and wrap them in an uncached bool filter.
http://elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-terms-filter.html