Missing Plungin: Install watcher in ELasticsearch

Currently, I'm using elastisearch version 5.5. Trying to install watchers in it.
Referred below document for information
https://www.elastic.co/guide/en/watcher/current/installing-watcher.html

cd /usr/share/elasticsearch
sudo bin/plugin install license
sudo bin/plugin install watcher

My bin folder doesn't have plugin

bin/elasticsearch-plugin install license
I get the below error

A tool for managing installed elasticsearch plugins

Commands

list - Lists installed elasticsearch plugins
install - Install a plugin
remove - removes a plugin from Elasticsearch

Non-option arguments:
command

Option Description


-h, --help show help
-s, --silent show minimal output
-v, --verbose show verbose output
ERROR: Unknown plugin license

So tried to download and install https://download.elastic.co/elasticsearch/release/org/elasticsearch/plugin/license/2.4.4/license-2.4.4.zip

I get below error
bin/elasticsearch-plugin install /data/ELK/license-2.4.4.zip

A tool for managing installed elasticsearch plugins

Commands

list - Lists installed elasticsearch plugins
install - Install a plugin
remove - removes a plugin from Elasticsearch

Non-option arguments:
command

Option Description


-h, --help show help
-s, --silent show minimal output
-v, --verbose show verbose output
ERROR: Unknown plugin /data/ELK/license-2.4.4.zip

Can anyone please shed some light on this and help me in proceeding with the installation

For 5.X please see https://www.elastic.co/guide/en/x-pack/current/installing-xpack.html

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