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Logstash throws error while installing plugins

While trying to install logstash plugin, I was getting below error:
$ /work/logstash/logstash-5.5.2/bin/logstash-plugin install logstash-input-cloudwatch
WARNING: A maven settings file already exist at ~/.m2/settings.xml, please review the content to make sure it include your proxies configuration.
Validating logstash-input-cloudwatch
Installing logstash-input-cloudwatch
Error Bundler::InstallError, retrying 1/10
An error occurred while installing logstash-core (5.5.2), and Bundler cannot continue.
Make sure that `gem install logstash-core -v '5.5.2'` succeeds before bundling.
Error Bundler::InstallError, retrying 2/10
An error occurred while installing logstash-core (5.5.2), and Bundler cannot continue.
Make sure that `gem install logstash-core -v '5.5.2'` succeeds before bundling.
Here are the things I did to make it work:
  1. Created maven ~/.m2/settings.xml file
    <?xml version="1.0" encoding="UTF-8"?>
    <settings xmlns=""
  2. Set environment variables:
    export JAVA_HOME="/work/elasticsearch/jre1.8.0_162/"
    export PATH=$JAVA_HOME/bin:$PATH
    export http_proxy=http://proxy.server:80
    export https_proxy=http://proxy.server:80
    export NO_PROXY="127.0*,[::1],localhost,.local"
    export no_proxy=$NO_PROXY
  3. Installed the plugin:
    /usr/bin/sudo -u root -H /bin/env https_proxy=http://proxy.server:80 HTTPS_PROXY=http://proxy.server:80 JRUBY_OPTS="-J-Dhttp.proxyHost=proxy.server -J-Dhttp.proxyPort=80" DEBUG=1 /work/logstash/logstash-5.5.2/bin/logstash-plugin install logstash-input-cloudwatch


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