You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mongodb_command_subscriber.rb
    path of file: ./repos/newrelic-ruby-agent/lib/new_relic/agent/instrumentation
    
    the code of the file until where you have to start completion: # This file is distributed under New Relic's license terms.
# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete 
    
        def operation(command_name)
          # from 2.0 to 2.5, :findandmodify was the command_name
          if command_name == :findandmodify
            :findAndModify
          else
            command_name
          end