Install Elasticsearch 9

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This guide shows a simple standard installation of Elasticsearch 9. The intention is to get you up and running quickly. However, in case you need a more advanced configuration or face any issues, have a look at the official Elasticsearch installation documentation. Adapt it wherever needed in case your use-case differs.

Installation

Download and Add the Public Signing Key

Install required tools:

sudo apt-get install apt-transport-https

Add repo key:

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elasticsearch-keyring.gpg

Add the Repository

echo "deb [signed-by=/usr/share/keyrings/elasticsearch-keyring.gpg] https://artifacts.elastic.co/packages/9.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-9.x.list

Install Elasticsearch

sudo apt-get update && sudo apt-get install elasticsearch

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Make sure to check the output and to copy the password of the built-in superuser. Otherwise, you have to recreate it by running /usr/share/elasticsearch/bin/elasticsearch-reset-password -u elastic.

Configuration

Open /etc/elasticsearch/elasticsearch.yml and adjust/uncomment the following values:

network.host: 0.0.0.0
transport.host: 0.0.0.0

Optional to increase the maximum context size to index:

http.max_content_length: 400mb

Start and Enable Elasticsearch

sudo systemctl enable elasticsearch.service --now

Next Steps

Go on with the installation of Zammad. After the installation of Zammad is completed, you can connect Zammad with Elasticsearch.