elasticsearchHow do I upgrade Elasticsearch?

1. To upgrade Elasticsearch, you first need to download the latest version from the Elasticsearch Download Page.

2. Once you have the latest version downloaded, you can use the elasticsearch-plugin command to install it. For example:

$ elasticsearch-plugin install file:/path/to/elasticsearch-x.x.x.zip

3. After the installation is complete, the output should be similar to this:

-> Installing file:/path/to/elasticsearch-x.x.x.zip
-> Downloading
.............................................................................................DONE
-> Installed file:/path/to/elasticsearch-x.x.x.zip into /usr/share/elasticsearch/plugins/x.x.x

4. After the installation is complete, you need to restart the Elasticsearch service for the changes to take effect. You can use the following command to do that:

$ sudo service elasticsearch restart

5. After the service is restarted, you can check the version of Elasticsearch by running the following command:

$ curl -XGET 'localhost:9200'

6. The output should be similar to this:

{
  "name" : "node-1",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "abcdefghijklmnopqrstuvwxyz",
  "version" : {
    "number" : "x.x.x",
    "build_hash" : "abcdefghijklmnopqrstuvwxyz",
    "build_date" : "YYYY-MM-DDTHH:mm:ss.zzzZ",
    "build_snapshot" : false,
    "lucene_version" : "x.x.x"
  },
  "tagline" : "You Know, for Search"
}

7. If the version number in the output matches the version you installed, then your upgrade was successful.

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