ELK 3. logstash

D:\ELK\logstash-5.6.2\logstash-5.6.2\bin>logstash-plugin install logstash-filter-json

Validating logstash-filter-json

Encoding::UndefinedConversionError: ""\xC0\xC9"" from UTF-16LE to ASCII-8BIT

                 encode at org/jruby/RubyString.java:7623

             initialize at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/registry.rb:172

              exception at org/jruby/RubyException.java:112

                  check at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/registry.rb:228

             QueryValue at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/registry.rb:281

                   read at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/registry.rb:584

                 read_s at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/registry.rb:634

               get_info at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/resolv.rb:147

                   open at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/registry.rb:386

                   open at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/registry.rb:493

               get_info at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/resolv.rb:137

        get_resolv_info at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/win32/resolv.rb:20

    default_config_hash at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/resolv.rb:909

        lazy_initialize at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/resolv.rb:926

            synchronize at org/jruby/ext/thread/Mutex.java:149

        lazy_initialize at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/resolv.rb:919

        lazy_initialize at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/resolv.rb:347

            synchronize at org/jruby/ext/thread/Mutex.java:149

        lazy_initialize at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/resolv.rb:345

          each_resource at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/resolv.rb:499

            getresource at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/1.9/resolv.rb:480

           api_endpoint at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/remote_fetcher.rb:92

                api_uri at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/source.rb:46

             load_specs at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/source.rb:182

             tuples_for at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/spec_fetcher.rb:261

        available_specs at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/spec_fetcher.rb:226

                   each at org/jruby/RubyArray.java:1613

            each_source at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/source_list.rb:97

        available_specs at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/spec_fetcher.rb:222

  search_for_dependency at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/spec_fetcher.rb:102

    spec_for_dependency at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/jruby/lib/ruby/shared/rubygems/spec_fetcher.rb:166

       logstash_plugin? at D:/ELK/logstash-5.6.2/logstash-5.6.2/lib/pluginmanager/util.rb:28

        validate_plugin at D:/ELK/logstash-5.6.2/logstash-5.6.2/lib/pluginmanager/install.rb:89

         verify_remote! at D:/ELK/logstash-5.6.2/logstash-5.6.2/lib/pluginmanager/install.rb:83

                   each at org/jruby/RubyArray.java:1613

         verify_remote! at D:/ELK/logstash-5.6.2/logstash-5.6.2/lib/pluginmanager/install.rb:81

                execute at D:/ELK/logstash-5.6.2/logstash-5.6.2/lib/pluginmanager/install.rb:58

                    run at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:67

                execute at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/subcommand/execution.rb:11

                    run at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:67

                    run at D:/ELK/logstash-5.6.2/logstash-5.6.2/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:132

                 (root) at D:\ELK\logstash-5.6.2\logstash-5.6.2\lib\pluginmanager\main.rb:48

D:\ELK\logstash-5.6.2\logstash-5.6.2\bin>

refer to this site, https://www.elastic.co/guide/en/logstash/current/plugins-filters-json.html