Elasticsearch

Install Elastic Search 8

Install Java

yum install java

- - - - - - - - - - - - - - - - - - - - - - - - - -
OR FOR THE CURRENT LATEST VERSION: 

yum install java-1.8.0-openjdk.x86_64

To verify your JRE is installed and can be used, run the command:

java -version

Downloading and Installing Elasticsearch:

sudo rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

Add Repo

sudo vi /etc/yum.repos.d/elasticsearch.repo

[elasticsearch-6.x]
name=Elasticsearch repository for 6.x packages
baseurl=https://artifacts.elastic.co/packages/6.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md

Install ElasticSearch

yum install elasticsearch

Once Elasticsearch is finished installing, open its main configuration file, elasticsearch.yml, in your editor:

vi /etc/elasticsearch/elasticsearch.yml

Change the following:
network.host: localhost

Running Elasticsearch As A Service:

 /bin/systemctl daemon-reload
/bin/systemctl enable elasticsearch.service
/bin/systemctl start elasticsearch.service
/bin/systemctl status elasticsearch.service

Check ElasticSearch Version

/usr/share/elasticsearch/bin/elasticsearch --version

Errors and Solutions

 org.elasticsearch.ElasticsearchSecurityException: invalid configuration for xpack.security.transport.ssl - [xpack.security.transport.ssl.enabled] is not set, but the following settings have been configured in elasticsearch.yml : [xpack.security.transport.ssl.keystore.secure_password,xpack.security.transport.ssl.truststore.secure_password]

To fix the above, run the following:

rm /etc/elasticsearch/elasticsearch.keystore
/usr/share/elasticsearch/bin/elasticsearch-keystore create