Reindex plugin for ES 2.1.2

Elastic Stack Elasticsearch
1

Where can I download this from. This version isn't supported anymore, so I am seeing this

sudo bin/plugin install reindex --verbose
-> Installing reindex...
Trying https://download.elastic.co/elasticsearch/release/org/elasticsearch/plugin/reindex/2.1.2/reindex-2.1.2.zip ...
Failed: FileNotFoundException[https://download.elastic.co/elasticsearch/release/org/elasticsearch/plugin/reindex/2.1.2/reindex-2.1.2.zip]; nested: FileNotFoundException[https://download.elastic.co/elasticsearch/release/org/elasticsearch/plugin/reindex/2.1.2/reindex-2.1.2.zip];

2

I don't remember that such a plugin existed. Where did you find this information?

3

When trying to reindex it complain about _reindex in my post command over http. So per some internet rederences, it was saying that I need to install the reindex module

4

I do not recall such plugin either. Where did you read about it? As you are using such an old version, you may need to reindex using an external script or application.