Add field from csv to event log send by logstash

Elastic Stack Logstash
20

excuse me, english is not my native language.

My dictionary.yml contains 15000 entries

yaml file example
sAMAccountName: displayName
C583: jane Doe
C090: John Doe
C587: Michael Jackson

my filter file

filter{
translate {
dictionary_path => "/etc/logstash/mutate/ExportADLDS.yml"
field => "[event_data][TargetUserName]"
destination => "[username]"
remove_field => [ "@version", "@timestamp" ]
override => true
}
}

The difficulty I have is matching the field "[event_data][TargetUserName]" of my event in ES with the "sAMAccountName" of my dictionary file. If e value is present, add a new field "[username]" in my event (and it is the value of the "displayName" from my dictionary.

EXAMPLE : if in the event the field "[event_data][TargetUserName]: "C587", I want a new field "[username]" to be added in my event with the value "Michael Jackson".

Thanks for your help, it is very hard to use filters