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ElasticSearch: Search Store

Brief

The ElasticSearch search engine, in spite of being a secondary store is one of the main core components. It is used to perform all search operations and several get operations. ElasticSearch supports full-text, faceted, and semantic & phonetic searching. Additionally, it is also horizontally scalable, thereby, giving us a flexibility to increase the number of nodes in order to facilitate high volume searches.

For ElasticSearch search store, fast SSD drives are recommended as they can bear lots of random IOPS, therefore avoiding performance bottlenecks. ElasticSearch is extremely memory intensive. In the latter, sorting and aggregations can both be memory hungry so enough heap space to accommodate this is important. Even when the heap is comparatively small, extra memory can be given to the OS file system cache. As many data structures used by Lucene (full-featured text search engine, which forms the crux of ElasticSearch) are disk-based formats, ElasticSearch leverages the OS cache to great effect.

Installation

Setup and Configuration

1. Download elasticsearch-2.1.1 (at location, /opt/cs/elastic).

   https://download.elasticsearch.org/elasticsearch/reease/org/elasticsearch/distribution/tar/elasticsearch/2.1.1/elasticsearch-2.1.1.tar.gz

1. Extract ElasticSearch.

   tar -zxvf elasticsearch-2.1.1.tar.gz
   

1. Change configuration.

   vim /opt/cs/elastic/elasticsearch-2.1.1/bin/elasticsearch
   

1. Specify Memory as following at the top of the file.

   export ES_HEAP_SIZE=10g
   
   vim /opt/cs/elastic/elasticsearch-2.1.1/config/elasticsearch.yml
   

1. Specify IP as following by uncommenting the line and adding IP of the machine in front of it:

   network.host: <IP_OF_ELASTIC_SERVER>
   

1. Also add following dependencies:

   script.inline: true
   script.indexed: true
   script.engine.groovy.file.aggs: true
   script.engine.groovy.file.mapping: true
   script.engine.groovy.file.search: true
   script.engine.groovy.file.update: true
   script.engine.groovy.file.plugin: true
   script.engine.groovy.indexed.aggs: true
   script.engine.groovy.indexed.mapping: false
   script.engine.groovy.indexed.search: true
   script.engine.groovy.indexed.update: false
   script.engine.groovy.indexed.plugin: false
   script.engine.groovy.inline.aggs: true
   script.engine.groovy.inline.mapping: false
   script.engine.groovy.inline.search: false
   script.engine.groovy.inline.update: false
   script.engine.groovy.inline.plugin: false
   http.cors.enabled: true
   http.cors.allow-origin: "*"
   

1. Install plugins.

   cd /opt/cs/elastic/elasticsearch-2.1.1/bin/
   
   ./plugin install file:<Path of CS-Refactored>CS-Refactored/ServerPlugins/elasticsearch/build/distributions/contentserv-plugin-1.0.0-SNAPSHOT.zip
   

1. Start ElasticSearch.

   ./elasticsearch -d
   

1. Check whether the service is running or not.

   netstat -tulpn | grep 9200
   

1. Start/Stop/Update Commands:

   Stop Elastic
     ssh elastic@ELASTIC_IP
     fuser -k 9200/tcp
   
   Start Elastic
     ssh elastic@ELASTIC_IP
     /opt/cs/elastic/elasticsearch-2.1.1/bin/elasticsearch -d
   

1. Remove plugins.

   cd /opt/cs/elastic/elasticsearch-2.1.1/bin/
   
   ./plugin remove contentserv-plugin
   

1. Add plugins.

   cd /opt/cs/elastic/elasticsearch-2.1.1/bin/
   
   ./plugin install file:<Path of plugin file>/contentserv-plugin-1.0.0-SNAPSHOT.zip
   

Last updated: Jul 27, 2018

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