A talk given at the JJTV Tools Night #3 on September 5, 2012: http://www.meetup.com/jjtv-il/events/77834332/

1. Introduction to Search Engines
with Lucene and ElasticSearch
Tomer Gabel, newBrandAnalytics

2. Overture
A search engine is…
a document store

3. Overture
LOREM IPSUM ALIQUA

4. lorem ipsum ... sed
Lower caseFi l t er
St opFi l t er
Overture

5. Overture
lorem
ipsum
aliqua

6. Overture
• Term query
– Maps a term to its
document
– Scoring is based
on:
• Number of hits per
document (TF)
• How “strong” a
match is (IDF)
lorem

7. Overture
• Boolean query
–Multiple clauses
–Each match can:
• Include document
(MUST)
• Affect score
(SHOULD)
• Exclude document
(MUST_NOT)
lorem ipsum
Occur s. MUST Occur s. MUST_NOT

8. Overture
• Phrase query
–All terms must
appear near
each other
–Slop is the
maximum token
“edit distance”
–Closer match =
higher score
lorem ipsum
Slop <= 2

9. It’s demo time.
Recitativo

10. It’s demo time.
Crescendo

11.  Content:
 Apache Lucene: http://lucene.apache.org/
 Elastic Search: http://www.elasticsearch.org/
 Code
samples:https://github.com/holograph/examples/tree/
master/lucene-demo
 PowerPoint template by SmileTemplates.com
 Thank you for your time!
 tomer@tomergabel.com
 http://www.tomergabel.com
Afterword