How to install plugin with .gem file?

Elastic Stack Logstash
1 
./logstash-plugin install file:///opt/ES/logstash-filter-ip2location-1.0.2.gem 
ERROR: Invalid pack for: file:///opt/ES/logstash-filter-ip2location-1.0.2.gem, reason: Invalid format, the pack must be in zip format, message: Invalid format, the pack must be in zip format
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How did you obtain this gem file?

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from https://rubygems.org/
https://github.com/ip2location/logstash-filter-ip2location

4

use a machine can connect to network .
use logstash-plugin install logstash-filter-ip2location install this
and use logstash-plugin output this filter plugin
slove it.
thanks all.

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