Cannot determine timezone from nil logstash

Elastic Stack Logstash
4

Thank you, here is my pipeline configuration :

input {
    jdbc {
	 clean_run => true
        jdbc_driver_library => "E:\ELK 8.10.2\logstash-conf\ojdbc6.jar"
        jdbc_driver_class => "oracle.jdbc.driver.OracleDriver"
        jdbc_connection_string => "*****"
        jdbc_user => "****"
		jdbc_password => "****"
		jdbc_default_timezone => "Asia/Riyadh"
        #schedule => "*/5 * * * *"
        statement => "SELECT CHANNEL FROM CALL_HISTORY_DETAILS_VIEW FETCH FIRST ROW ONLY"
        #use_column_value => true
		#tracking_column => "CALLS"
		tags => ["oraclelogger"]
    }
}
filter {
date {
      match => [ "CALL_STRAT_DATE_TIME", "yyyy/MM/dd HH:mm:ss" ] 
      timezone => "Asia/Riyadh"
      target=> "@timestamp" 
 }
}
output{
    elasticsearch {	
        hosts => ["http://****:9200/"]
		index => "testlogger_index"
		user => "elastic"
		password => "****"
		ssl => false
		ssl_certificate_verification => false
    }
   
}

I have also tried converting @timestamp itself to a new field (through filter) but it didnt work, tried different format also (UNIX/ISO) still not getting any results.
Tried selecting time column from DB with TO_CHAR function and converted to the format 'yyyy/MM/dd HH:mm:ss', tried converting UTC

CAST(
    FROM_TZ(Call_Start_Time, 'Asia/Riyadh') AT TIME ZONE 'UTC' AS TIMESTAMP
  ) AS Call_Start_Time_UTC

This is getting really frustrating tbh :frowning: