[Try blocks in Ruby] How to use a begin...rescue...else...ensure block for exception handling

try_block.rb

# Max number of retries if error occurs while pruning index
MAX_NUM_RETRIES = 3

# Number of seconds to wait between retries
RETRY_TIMEOUT_SECONDS = 5

begin
  retries ||= 0
  # Do something
rescue StandardError => e
  # Rescue exception type #1
  if (retries += 1) < MAX_NUM_RETRIES
    sleep RETRY_TIMEOUT_SECONDS
    retry
  else
    puts "ERROR: #{e}"
  end
rescue SomeOtherError => e
  # Rescue exception type #2
    puts "ERROR: #{e}"
else
  # Do something else if no exception
ensure
  # Do something regardless of exception / no exception
end