Adding fields based on match

Hi All,
I have the following scenario:
1 index containing json fields.
I need to match Event1_fieldA to Event2_fieldB.
If there is a match, add additional existing field from Event2 to Event1.
How would I achieve this?
Do I have to use logstash?
I tried playing with the aggregate filter but got nothing useful.
This is what I have so far:

if [somefield] == "somevalue" {
aggregate {
     task_id => "%{[fieldA][fieldB]}"
   code => "
     map['Test'] = event.get('additional existing field in Event2')
   map_action => "create"
   end_of_task => true
   timeout => 3


Any help would be greatly appreciated.


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