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Elasticsearch On Magento 2.3x

1.1a Install the JDK on Ubuntu

  java -version 
  sudo apt -y install default-jre
  sudo apt -y install openjdk-11-jre-headless
  sudo apt -y install openjdk-8-jre-headless

To install JDK 1.8 on Ubuntu, enter the following commands as a user with root privileges:

  sudo add-apt-repository -y ppa:webupd8team/java
  sudo apt-get -y update
  sudo apt-get install -y oracle-java8-installer

1.1b Install the JDK 1.8 on Ubuntu

  sudo apt-get -y update
  sudo apt-get install -y openjdk-8-jdk

1.2a Install Elasticsearch 7.x

  wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
  sudo apt-get install apt-transport-https
  echo "deb https://artifacts.elastic.co/packages/7.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-7.x.list
  sudo apt-get update && sudo apt-get install elasticsearch
  
  # OR,
  wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.11.1-amd64.deb
  wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.11.1-amd64.deb.sha512
  shasum -a 512 -c elasticsearch-7.11.1-amd64.deb.sha512 
  sudo dpkg -i elasticsearch-7.11.1-amd64.deb

  # OR
  curl -fsSL https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elastic.gpg2
  echo "deb [signed-by=/usr/share/keyrings/elastic.gpg] https://artifacts.elastic.co/packages/7.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-7.x.list
  sudo apt update
  sudo apt install elasticsearch      
  sudo nano /etc/elasticsearch/elasticsearch.yml
  #      network.host: localhost     . . .

1.3 Start & Check Status Elasticsearch:

  # Running with Service:
  sudo systemctl start elasticsearch
  sudo systemctl enable elasticsearch
  systemctl status elasticsearch.service
  
  # Securing 
  sudo ufw allow from 198.51.100.0 to any port 9200
  sudo ufw enable
  sudo ufw status
  
  # Testing
  curl -X GET 'http://localhost:9200'
  curl -X GET 'http://localhost:9200/_nodes?pretty'
  
  # Using 
  curl -XPOST -H "Content-Type: application/json" 'http://localhost:9200/tutorial/helloworld/1' -d '{ "message": "Hello World!" }'
  curl -X GET -H "Content-Type: application/json" 'http://localhost:9200/tutorial/helloworld/1'
  
  
  
  # startup system boot:
  
  sudo /bin/systemctl daemon-reload
  sudo /bin/systemctl enable elasticsearch.service
  sudo systemctl start elasticsearch.service
  sudo systemctl stop elasticsearch.service
  
  sudo journalctl -f
  sudo journalctl --unit elasticsearch

1.4 — Configuring Elasticsearch

To configure Elasticsearch, we will edit its main configuration file elasticsearch.yml where most of its configuration options are stored. This file is located in the /etc/elasticsearch directory. Use your preferred text editor to edit Elasticsearch’s configuration file. Here, we’ll use nano:

  sudo nano /etc/elasticsearch/elasticsearch.yml

        . . .
  # ---------------------------------- Network -----------------------------------
  #
  # Set the bind address to a specific IP (IPv4 or IPv6):
  #
  network.host: localhost
  
  
  sudo systemctl start elasticsearch
  sudo systemctl enable elasticsearch
  
  curl -X GET 'http://localhost:9200'

1.5 Verify Elasticsearch

Elasticsearch is working by entering the following command on the server on which it is running:

  curl -XGET '<host>:9200/_cat/health?v&pretty'
  
  curl -XGET 'localhost:9200/_cat/health?v&pretty'

A message similar to the following is displayed:

epoch      timestamp cluster       status node.total node.data shards pri relo init unassign pending_tasks
1519701563 03:19:23  elasticsearch green           1         1      0   0    0    0        0             0


        # Check version
        
        curl http://localhost:9200

1.8 Magento admin & Cli:

  Go to STORES > CONFIGURATION > CATALOG > CATALOG > CATALOG SEARCH > Elasticsearch Index Prefix.
  
  # Set a different prefix for each store, any random one for each. Reindex and flush cache on each store.

        php -d memory_limit=2G bin/magento index:reindex

        php -f bin/magento config:show catalog/search/engine
        
        php bin/magento config:set catalog/search/engine none
        
        php bin/magento config:set catalog/search/engine 'elasticsearch7'

1.7 Removing ElasticSearch from @Magento 2.4" Yireo_RemoveSearch

    php bin/magento module:disable Magento_AdvancedSearch Magento_CatalogSearch Magento_Elasticsearch Magento_Elasticsearch Magento_Elasticsearch-6  Magento_Elasticsearch-7 Magento_InventoryCatalogCearch   Magento_Inventory-Elasticsearch Magento_Search  Elasticsearch_Elasticsearch

Problem:: elasticsearch.service: Failed with result 'exit-code'.

  sudo nano /etc/elasticsearch/elasticsearch.yml
  Your network settings should be:
  
  # Set the bind address to a specific IP (IPv4 or IPv6):
  #
  network.host: 127.0.0.1
  #
  # Set a custom port for HTTP:
  #
  http.port: 9200

Job for elasticsearch.service failed because the control process exited with error code.See "systemctl status elasticsearch.service" and "journalctl -xe" for details.

1.5 Remove/Uninstall Elasticsearch

exception(s): Exception #0 (Elasticsearch\Common\Exceptions\BadMethodCallException): Namespace [suggest] not found

Ref: