Fundamentals of query rewriting (part 1): introduction to query expansion
Johannes Peter introduces query expansion in the first part of a series on fundamentals of query rewriting
Better term-centric scoring in Elasticsearch with BM25F and the combined_fields query
How the combined_fields query introduces better term-centric scoring in Elasticsearch with BM25F
Silos Are the Enemy of AI Powered Search
As a contributor to AI Powered Search I’m struck by how often organizational, rather than technical, challenges stymie machine learning adoption. Let’s explore one of those challenges: silos between…
The Missing Hello World for OpenNLP
I wrote this back in 2012 for version 1.5.2-incubating, and never published it. So I’m updating it for the October 2018 version of OpenNLP, 1.9.0. Visit http://opennlp.apache.org/ and you…
Enterprise Data World 2018 Recap
In April I went on a pilgrimage to Enterprise Data World to encourage my colleagues in the Data world who typically are focused on issues of Data Governance, Data…
Why We Created Search Relevance Training
I am a big proponent of Solr and Elasticsearch search engines BUT… … they are frameworks. A bag of tools. I can teach you how they fit together in…
Elasticsearch Learning to Rank 1.0.1 Released
Thanks so much to community members who let us know that Elasticsearch Learning to Rank did not work with Elastic Cloud/XPack Security. Today Elastic Learning to Rank 1.0.1 is…
Solr Synonyms and Taxonomies: Mea Culpa
I screwed up! Mea Culpa. Let he who is without synonyms throw the first rock! In my talk Taxonomical Semantical Magical Search, I presented an index-time hypernym/hyponym expansion solution….
Vespa vs Lucene: First Impressions
As we learn more about Vespa, we wanted to give our initial impressions when comparing to Lucene-based search (Solr/Elasticsearch). This is based on initial passes with Vespa and our…
Caching In Elasticsearch
Responding to queries takes CPU time, memory, and in unfortunate cases, wall time as well. Increasing the power of a cluster helps, over-provisioning can be very expensive. Caching is…
Solr UTF-8 Character Handling
Searching for non-ASCII characters can be a challenge. There are a number of reasons for doing so, even in a primarily English corpus: Accented characters in names and words…
BM25F in Lucene with BlendedTermQuery
As part of the London hack days Diego Ceccarelli started a BM25F implementation. I began to continue it at Lucene Revolution’s Lucene hackathon. I realized though that when you…