Magento Open Source 2.4.0 Upgrade Notes

Issues:

'We can't find products matching the selection.'

Summary: This error is shown on all category pages. No products are displayed.

Initial Thoughts: Presumed upgrade or install of Elastic Search server. Remediation Install Elastic Search. Solution Applied Open terminal and run the following commands (These commands may vary depending on your server environment).

First we need to install PGP key 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
sudo update-rc.d elasticsearch defaults 95 10
sudo -i service elasticsearch start

To check if Elastic Search is running or not run http://127.0.0.1:9200/ in browser and if you see below response then Elastic Search is running

{
  "name" : "root",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "ogkAKBNnTheVFrPs3Aw5Ug",
  "version" : {
    "number" : "7.8.1",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "b5ca9c58fb664ca8bf9e4057fc229b3396bf3a89",
    "build_date" : "2020-07-21T16:40:44.668009Z",
    "build_snapshot" : false,
    "lucene_version" : "8.5.1",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

What is Elastic Search Elastic Search is a powerful search engine that can be installed on a server. In the case of Magento, it mainly improves speed for product searching.

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