Andrea Gazzarini Apache Lucene, Apache Solr, Indexing, Information Retrieval, Invisible Queries, Main Blog, Ngrams, Search, Solr schema, Token filters, Tokenizer, Topic Modeling

Apache Solr: orchestrating Known item and Full-text search

Scenario You’re working as a search engineer for XYZ Ltd, a company which sells electric components. XYZ provided you the application logs of the last six months, and some business requirements. Two kinds of customers, two kinds of requirements, two kinds of search The log analysis shows that XYZ has mainly two kinds of customers: … Continue reading Apache Solr: orchestrating Known item and Full-text search

Andrea Gazzarini Analysis, Apache Lucene, Apache Solr, Feature Engineering, Indexing, Information Retrieval, Lucene index, Main Blog, Query parsers, Search, Solr schema

Give the height the right weight: quantities detection in Apache Solr

Quantity detection? What is a quantity? And why do we need to detect it? A quantity, as described by Martin Fowler in his "Analysis Patterns" [1] is defined as a pair which combines an amount and unit (such as 30 litres, 0.25 cl, or 140 cm). In search-based applications, there are many cases where you may … Continue reading Give the height the right weight: quantities detection in Apache Solr

Alessandro Benedetti Apache Lucene, Apache Solr, Document Frequency, Indexing, Indexing options, Lucene index, Main Blog, Norms, Solr schema, Term Frequency, Term offsets, Term positions

Exploring Solr Internals : The Lucene Inverted Index

    Introduction This blog post is about the Lucene Inverted Index and how Apache Solr internally works. When playing with Solr systems, understanding and properly configuring the underline Lucene Index is fundamental to deeply control your search. With a better knowledge of how the index looks like and how each component is used, you … Continue reading Exploring Solr Internals : The Lucene Inverted Index

Alessandro Benedetti Apache Lucene, Apache Solr, Classification, Indexing, Machine Learning, Main Blog, Search, Update Request Processor

Solr Document Classification – Part 1 – Indexing Time

Introduction This blog post is about the Solr classification module and the way Lucene classification has been integrated at indexing time. In the previous blog [1] we have explored the world of Lucene Classification and the extension to use it for Document Classification . It comes natural to integrate Solr with the Classification module and … Continue reading Solr Document Classification – Part 1 – Indexing Time