Elasticsearch is a free and open source distributed search and analytics engine built on Apache Lucene. It allows for easy scaling, a RESTful API, and supports advanced search features like full text search, facets, fuzzy search, and autocomplete. Elasticsearch can be used with .NET through the NEST client, which maps requests and responses to strongly typed objects.

1. ELASTICSEARCH – SEARCH
DONE RIGHT

2. Bart Wullems
Practice Manager NCORE
bart.wullems@ordina.be
https://bartwullems.blogspot.com

16. • ElasticSearch is a free and open source distributed inverted index
created by shay banon.
• Build on top of Apache Lucene
• Lucene is a java-based full text search index implementation.
• First public release version v0.4 in February 2010.

18. • Easy to scale (Distributed)
• Everything is one JSON call away (RESTful API)
• Unleashed power of Lucene under the hood
• Excellent Query DSL
• Support for advanced search features (Full Text, Facets, Fuzzy Search,
Autocomplete, Highlights, ...)
• Configurable and Extensible
• Document Oriented
• Schema free

20. JSON
FIELD 1
MAPPING
FIELD 2
FIELD ...

21. JSON
FIELD 1
MAPPING
FIELD 2
FIELD ...
NODE 1
P1 R1 R1
JSON
JSON
JSON

22. CLUSTER
NODE 1
P1
NODE 2MASTER
R2 R2R1 R1
P2 P2

29. • 2 official clients:

30. •High-level client that internally uses the low-
level Elasticsearch.Net client
•Maps requests and responses to strongly typed
objects
•Takes advantage of .NET features where they
make sense (i.e., covariant collection result
types, type and index inference)
•Low-level client that provides a one-to-one
mapping with the Elasticsearch REST API
•No dependencies
•Almost completely generated from the official
REST API spec which makes it easy to keep up to
date

33. https://github.com/wullemsb/D
emoTechoramaElasticSearch

35. • ElasticSearch brings “Google like” search into your reach
• Enabled in .NET(Core) through NEST and ElasticSearch.NET
• Search remains a complex beast
• The difficulty is not in the search but in the indexing
• Users love it!