Deprecate uninstall for Plugin Manager

Adds remove and deprecates uninstall

Fixes #6041

Fixes #6042

lib/pluginmanager/remove.rb

@@ -0,0 +1,41 @@
+# encoding: utf-8
+require "pluginmanager/command"
+
+class LogStash::PluginManager::Remove < LogStash::PluginManager::Command
+
+  parameter "PLUGIN", "plugin name"
+
+  def execute
+    signal_error("File #{LogStash::Environment::GEMFILE_PATH} does not exist or is not writable, aborting") unless File.writable?(LogStash::Environment::GEMFILE_PATH)
+
+    ##
+    # Need to setup the bundler status to enable uninstall of plugins
+    # installed as local_gems, otherwise gem:specification is not
+    # finding the plugins
+    ##
+    LogStash::Bundler.setup!({:without => [:build, :development]})
+
+    # make sure this is an installed plugin and present in Gemfile.
+    # it is not possible to uninstall a dependency not listed in the Gemfile, for example a dependent codec
+    signal_error("This plugin has not been previously installed, aborting") unless LogStash::PluginManager.installed_plugin?(plugin, gemfile)
+
+    # since we previously did a gemfile.find(plugin) there is no reason why
+    # remove would not work (return nil) here
+    if gemfile.remove(plugin)
+      gemfile.save
+
+      puts("Removing #{plugin}")
+
+      # any errors will be logged to $stderr by invoke!
+      # output, exception = LogStash::Bundler.invoke!(:install => true, :clean => true)
+      output = LogStash::Bundler.invoke!(:install => true, :clean => true)
+
+      remove_unused_locally_installed_gems!
+    end
+  rescue => exception
+    gemfile.restore!
+    report_exception("Remove Aborted", exception)
+  ensure
+    display_bundler_output(output)
+  end
+end