05. Searching – The Basic Tools

1. ElasticSearch
Searching – The Basic Tools
http://elastic.openthinklabs.com/

2. Serching – The Basic Tools
● A search can be any of the following:
● A structured query on concrete fields like gender or age, sorted by a
field like join_date, similar to the type of query that you could
construct in SQL
● A full-text query, which finds all documents matching the search
keywords, and returns them sorted by relevance
● A combination of the two
● To use Elasticsearch to its full potential, you need to
understand three subjects
● Mapping : How the data in each field is interpreted
● Analysis : How full text is processed to make it searchable
● Query DSL : The flexible, powerful query language used by
Elasticsearch

3. The Empty Search
GET /_search
Important section
● hits
● took
● shards
● timeout

4. Multi-index, Multitype
● /_search : Search all types in all indices
● /gb/_search : Search all types in the gb index
● /gb,us/_search : Search all types in the gb and us indices
● /g*,u*/_search : Search all types in any indices beginning
with g or beginning with u
● /gb/user/_search : Search type user in the gb index
● /gb,us/user,tweet/_search : Search types user and tweet
in the gb and us indices
● /_all/user,tweet/_search : Search types user and tweet in
all indices

5. Pagination
● Elasticsearch accepts the from and size
parameters:
● size : Indicates the number of results that should be
returned, defaults to 10
● from : Indicates the number of initial results that should
be skipped, defaults to 0
GET /_search?size=5
GET /_search?size=5&from=5
GET /_search?size=5&from=10

6. Search Lite
GET /_all/tweet/_search?q=tweet:elasticsearch
GET /_search?q=%2Bname%3Ajohn+%2Btweet%3Amary
GET /_search?q=mary
+name:john +tweet:mary
+name:(mary john) +date:>2014-09-10 +(aggregations geo)
?q=%2Bname%3A(mary+john)+%2Bdate%3A%3E2014-09-10+%2B(aggregations+geo)

7. Referensi
● ElasticSearch, The Definitive Guide, A Distrib
uted Real-Time Search and Analytics Engine, Cl
inton Gormely & Zachary Tong, O’Reilly