Difference between revisions of "Elasticsearch"

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(Created page with "Elasticsearch is a distributed RESTful search engine built for the cloud. Features include: * Distributed and Highly Available Search Engine. ** Each index is fully sharded w...")
 
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This site uses Elasticsearch for it's search functionality under the hood.
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{{Feature
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|explains= Search
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|description= This site uses Elasticsearch for the best possible search experience [[File:System-search.svg|link=Search|thumb|64px]]
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|notes=
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|tests=
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|examples=
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}}
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== About ==
 
Elasticsearch is a distributed RESTful search engine built for the cloud. Features include:
 
Elasticsearch is a distributed RESTful search engine built for the cloud. Features include:
  
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* Open Source under the Apache License, version 2 ("ALv2")
 
* Open Source under the Apache License, version 2 ("ALv2")
  
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This site uses Elastic Search for it's search functionality under the hood.
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== Video ==
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* [https://vimeo.com/136326424 Building Elasticsearch: From Idea to {code} to Adoption] The back side of a napkin, a pen, and a few beverages are often the ingredients that yield good ideas. Elasticsearch had a different origin. It started with a need for a simple search box for a collection of recipes. '''Shay Banon''', creator of Elasticsearch and CTO at Elastic
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* https://www.elastic.co/about
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== Elasticsearch for MediaWiki ==
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To improve the out-of-the-box search experience with MediaWiki, you should install the [[mw:Extension:CirrusSearch]].  CirrusSearch is just a connector to the Elasticsearch engine.  Thus, to use CirrusSearch, first install the [[Elasticsearch]] system (you can use [https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-repositories.html the repositories for that]). 
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This system has three components: Elastica, CirrusSearch, and Elasticsearch.
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; Elastica : Elastica is a MediaWiki extension that provides the library to interface with Elasticsearch. It wraps the [https://github.com/ruflin/Elastica Elastica] library. It has no configuration.
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; CirrusSearch : CirrusSearch is a MediaWiki extension that provides search support backed by Elasticsearch.
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; Elasticsearch : is a Java application, so you need [[Java]] installed as well.  At the time of this writing, there is a version mismatch.  Elasticsearch is at version 2.1.1 in the repositories, but CirrusSearch is only compatible with the older 1.7 version.
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== Installation ==
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Here's a quick example of how we got all the parts installed on an [[Ubuntu]] server.
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<source lang="bash">
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# is the curl extension to PHP installed?
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php -i |grep -C2 curl
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# no curl?
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sudo apt-get install php5-curl
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pushd extensions
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java -version
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# no java
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sudo apt-get install default-jre
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# need the jdk
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sudo apt-get install default-jdk
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# add JAVA_HOME to /etc/environment
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sudo update-alternatives --config java
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echo 'JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java' |sudo tee -a /etc/environment
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source /etc/environment
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echo $JAVA_HOME
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wget -qO - https://packages.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
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echo "deb http://packages.elastic.co/elasticsearch/2.x/debian stable main" | sudo tee -a /etc/apt/sources.list.d/elasticsearch-2.x.list
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#### don't do this because 2.1.1 is too new
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#### sudo apt-get update && sudo apt-get install elasticsearch
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#### get the 1.7.x version and install that
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wget https://download.elastic.co/elasticsearch/elasticsearch/elasticsearch-1.7.4.deb
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sudo dpkg -i elasticsearch-1.7.4.deb
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echo PATH=$PATH:/usr/share/elasticsearch/bin/ | sudo tee -a /etc/environment
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source /etc/environment
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which elasticsearch
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sudo service elasticsearch start
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# check with curl (see below)
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# using SysV init
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sudo update-rc.d elasticsearch defaults 95 10
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git clone https://gerrit.wikimedia.org/r/p/mediawiki/extensions/CirrusSearch.git
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git clone https://gerrit.wikimedia.org/r/p/mediawiki/extensions/Elastica.git
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cd Elastica
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composer install
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# load Special:Version to check
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sudo -u www-data php ./w/extensions/CirrusSearch/maintenance/updateSearchIndexConfig.php
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sudo -u www-data php  /var/www/freephile.com/www/w/extensions/CirrusSearch/maintenance/forceSearchIndex.php --skipLinks --indexOnSkip
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sudo -u www-data php  /var/www/freephile.com/www/w/extensions/CirrusSearch/maintenance/forceSearchIndex.php --skipParse
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</source>
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Checking if elasticsearch is running
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<source lang="bash">
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curl -X GET http://localhost:9200/
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</source>
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<source lang="javascript">
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{
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  "name" : "Carmella Unuscione",
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  "cluster_name" : "elasticsearch",
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  "version" : {
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    "number" : "2.1.1",
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    "build_hash" : "40e2c53a6b6c2972b3d13846e450e66f4375bd71",
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    "build_timestamp" : "2015-12-15T13:05:55Z",
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    "build_snapshot" : false,
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    "lucene_version" : "5.3.1"
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  },
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  "tagline" : "You Know, for Search"
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}
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// second time around with the older version installed
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{
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  "status" : 200,
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  "name" : "Richard Rider",
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  "cluster_name" : "elasticsearch",
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  "version" : {
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    "number" : "1.7.4",
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    "build_hash" : "0d3159b9fc8bc8e367c5c40c09c2a57c0032b32e",
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    "build_timestamp" : "2015-12-15T11:25:18Z",
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    "build_snapshot" : false,
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    "lucene_version" : "4.10.4"
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  },
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  "tagline" : "You Know, for Search"
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}
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</source>
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== Resources ==
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* https://phabricator.wikimedia.org/diffusion/ECIR/browse/master/CirrusSearch.php
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* https://git.wikimedia.org/blob/mediawiki%2Fextensions%2FCirrusSearch.git/HEAD/README
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* https://wikitech.wikimedia.org/wiki/Search
  
 
[[Category:Search]]
 
[[Category:Search]]

Revision as of 12:39, 30 January 2016

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