code: public static List<String> executeScript(InstanceConfiguration config, CommandLine command)
      {
          return executeScript(config, command, null, null, false);
      }
docs: Run the given command as a process within the supplied instance config context
  and wait until it finalizes. An ElasticsearchSetupException is thrown if the exit code
  is not 0.
  @param config - the instance config
  @param command - the command to execute
  @return the output (as separate lines)