What is the fine-grained topic of the following text: I intend to talk about the functionality that ElasticSearch provides, how to use it from Perl, and the road map of changes planned for ElasticSearch.pm, including ElasticSearch::QueryBuilder (similar to SQL::Abstract, but for ES) and ElasticSearch::Protocol::Memcached (accessing the ES server using the memcached protocol over TCP, rather than the default slower HTTP protocol). Only return the topic.
Using ElasticSearch with Perl and planned changes for ElasticSearch.pm