Get current time using ruby filter in logstash

I need to add the filed value for my index as current time. like Updated_date column value as current time.
As reference of post :Add field timestamp with current time
we need ruby filter to create a field with the current time.

I am using :
ruby {
code => "event.set('Updated_date',event.get('@timestamp'));
but I am getting the result as the timeof data inserted into elasticsearch first time, not after updating the data .
how to create ruby filter to get the current time ?

so, you have the current timestamp in @timestamp and you want to use that time value to name your indices? I'm not sure I understand

Your example takes the value from @timestamp and places it in a field called Updated_date. What does your elasticsearch output look like?

I have another column in my index as ''amount'' , I am updating the amount value once or a twice a day . so the "Updated_date " column is for getting the last updated time for "amount".
the output of my script is a timestamp : 2017-06-15T09:46:56.415Z

can you show me the elasticsearch output portion of the pipeline?

I am just printing the required columns in the output section after updating the amount values:
codec => line { format => "%{amount}|%{updated_date}"}
hosts => ["localhost:9200"]
user => "elastic"
password => "changeme"
index => "thresholds"
document_id => "%{issuer_id}"
doc_as_upsert => "true"

have you tried with action => "update" ?

No , I haven't tried. will action => "update" ? provide me the current timestamp(after updation) of the record?

I was only able to have a similar feature as what you wanted by creating explicit created_at and updated_at fields:

input { stdin { codec => json } }
filter {
  ruby {
    code => "event.set('updated_date', event.get('@timestamp'))"
output {
  elasticsearch {
    action => update
    document_id => "%{my_id}"
    upsert => '{ "document_id": "%{my_id}", "value": "%{value}", "created_at": "%{@timestamp}", "updated_at": "%{@timestamp}" }'

This gives me as:

  "_index": "logstash-2017.06.20",
  "_type": "logs",
  "_id": "hey",
  "_version": 2,
  "found": true,
  "_source": {
    "document_id": "hey",
    "value": 2,
    "created_at": "2017-06-20T14:07:45.868Z",
    "@timestamp": "2017-06-20T14:08:23.229Z",
    "my_id": "hey",
    "@version": "1",
    "host": "Joaos-MBP-5",
    "updated_date": "2017-06-20T14:08:23.229Z"

after sending these two events:

{ "my_id": "hey", "value": 1 }
{ "my_id": "hey", "value": 2 }

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