Netflow module interface information missing - Elasticsearch 7.3.2 , installed ELK setup ( elasticsearch, Logstash & Kibana)

installed elasticsearch 7.3.2 for storing logs
and installed logstash 7.3.2 for both shipping as well as processing.
and installed kibana for visualization tool
all these three components installed on same machine and enabled netflow module to capture the flow logs from routers and switches to analyze the bandwidth and trafffic flow,

i am able to get successfully all the traffic, except the interface information , like which interface that packet is captured example Gi0/0 or E1/1 or serial or either interface description of the interface atleast,

Added below entries in “/etc/logstash/logstash.yml” ( to enable netflow module on ELK server)

modules:
  - name: netflow
   	 var.input.udp.port: 9995
 	   var.elasticsearch.hosts: http://127.0.0.1:9200
   	 var.elasticsearch.ssl.enabled: false
   	 var.kibana.host: 127.0.0.1:5601
   	 var.kibana.scheme: http
   	 var.kibana.ssl.enabled: false
   	 var.kibana.ssl.verification_mode: disable

to start the netflow module,
./bin/logstash --path.settings /etc/logstash --modules netflow –setup &

configuration enabled on router/switch
flow exporter FLOW_ESLOKB
 destination xx.xx.xx.xx
 source GigabitEthernet0/0
 transport udp 9995
 export-protocol netflow-v5

flow monitor FLOW_MON
 exporter FLOW_ESLOKB
 cache timeout active 60
 record netflow-original
!
interface Gi0/0
ip flow monitor FLOW_MON input
ip flow monitor FLOW_MON output
`````

Regards,
Elaya Raja