Elastic Search guide Linux

ES will work standalone with no other components

ES installation

Install using yum installer

 sudo rpm --import https://packages.elastic.co/GPG-KEY-elasticsearch
 sudo sh -c 'curl https://gist.githubusercontent.com/nl5887/b4a56bfd84501c2b2afb/raw/elasticsearch.repo >> /etc/yum.repos.d/elasticsearch.repo'
 sudo yum install -y elasticsearch

Alternative: Install with RPM

 wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-8.9.1-x86_64.rpm
 wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-8.9.1-x86_64.rpm.sha512
 shasum -a 512 -c elasticsearch-8.9.1-x86_64.rpm.sha512 
 sudo rpm --install elasticsearch-8.9.1-x86_64.rpm
 sudo rpm -e elasticsearch-8.9.1-x86_64.rpm

ES Configuration

Ensure service is started automatically

 sudo chkconfig elasticsearch on

Reduce memory usage

 sudo nano /etc/elasticsearch/jvm.options
 -Xms256m
 -Xmx256m

Ensure public access on the same server

 sudo nano /etc/elasticsearch/elasticsearch.yml

 xpack.security.enabled: false

 xpack.security.http.ssl:
   enabled: false

 xpack.security.transport.ssl:
   enabled: false

 http.host: 0.0.0.0

Start service the first time

 sudo service elasticsearch start

Validate service is running

 curl 'http://localhost:9200/app/_count?pretty&q='y

Reindexing existing data

Make sure that the application name is correct in the applicationName

Data can be reindexed using

 Backend > Admin services > Rebuild artifacts > Index blobs

Optionally include the files too

 Backend > Admin services > Rebuild artifacts > Index files

File indexer installation

File indexing is handled by a seperate service

TS indexing service

See Elastic_search_and_OCR#Setting_up_basic_search_service for details

For the file Indexer to work multiple components are required

ImageMagick
Tesseract OCR
GhostScript

See Elastic_search_and_OCR#Adding_OCR_capability for details

Elastic search install

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