This event will be hosted by the Barcelona on Rails Meetup Group. Many thanks to them for inviting us to speak, and for XING for hosting all of us!

Details:
Please look for more information the Barcelona on Rails Meetup group on their mailing list list.

https://groups.google.com/forum/#!forum/barcelonaonrails

For RSVPs to attend, please respond here on meetup.com

Talk Information:

Our speaker for this meetup will be Clinton Gormley, Software Engineer at Elasticsearch and one of the authors of Elasticsearch: The Definitive Guide. Elasticsearch's Query DSL - Not Just for Wizards!

The Elasticsearch Query DSL is a rich, flexible, powerful query language for full text and structured search, but with power comes complexity. Which of the 40 available queries should you use? What's a filter and when should you use it? How do you combine multiple filters, or multiple queries or queries with filters?

To most users, "relevance", and how it is affected by different queries, is a black box. Multi-field queries in particular can be difficult to get right if you don't understand how they work. In this talk, I will explain the Query DSL from the ground up: how filters and queries use the inverted index to find matching documents, how the relevance score is calculated, how to combine the filter/query building blocks into complex statements. And finally, I will talk about the pitfalls of multi-field queries and how to avoid them.

Speaker Biography:
A South African doctor turned programmer, I was the first user of Elasticsearch and wrote the Perl API back in 2010. When Elasticsearch formed a company in 2012, I joined as the maintainer of the Perl modules. Now I spend a lot of my time designing the user interfaces and writing about Elasticsearch.