# Logstash syncing from Mongodb to Elasticsearch - Null values in array data objects
**URL:** https://discuss.elastic.co/t/logstash-syncing-from-mongodb-to-elasticsearch-null-values-in-array-data-objects/309965
**Category:** Logstash
**Created:** [July 19, 2022, 1:44am UTC](https://discuss.elastic.co/t/logstash-syncing-from-mongodb-to-elasticsearch-null-values-in-array-data-objects/309965 "2022-07-19T01:44:44Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@bindu1](https://discuss.elastic.co/u/bindu1)
#### Post date: [July 19, 2022, 1:44am UTC](https://discuss.elastic.co/t/logstash-syncing-from-mongodb-to-elasticsearch-null-values-in-array-data-objects/309965/1 "2022-07-19T01:44:44Z")
Hello Community,
I'm using logstash to sync data from Mongdb to Elasticsearch & Kibana using JDBC input plugin. But array data fields are being synced as NULL values in ES/Kibana.
Below is logstash.conf:
```auto
input {
jdbc {
type => "courses_data"
jdbc_driver_library => "/usr/share/logstash/logstash-core/lib/jars/mongojdbc4.1.jar"
jdbc_driver_class => "com.mongodb.MongoClient"
jdbc_connection_string => " ********"
jdbc_user => "admin"
jdbc_password => " ****"
jdbc_validate_connection => true
schedule => "*/30 * * * * *"
use_column_value => true
tracking_column => "_id"
tracking_column_type => "numeric"
statement => "select * from courses"
}
}
filter
{
if [type] == "courses_data"
{
mutate
{
rename => { "_id" => "course_id" }
}
}
}
output {
stdout {
codec => rubydebug
}
if [type] == "courses_data" {
elasticsearch {
action => "update"
doc_as_upsert => true
document_id => "%{course_id}"
index => "courses_data"
hosts => ["elasticsearch:9200"]
ssl_certificate_verification => false
}
}
}
```
Below is the sample data field which is being synced as NULL in ES.
```auto
"tags": ["mwi", "metalworks institute", "publishing", "copyright", "SU-T1000"],
```
How can I sync array fields from mongdb into ES/Kibana ?
TIA
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [August 16, 2022, 1:45am UTC](https://discuss.elastic.co/t/logstash-syncing-from-mongodb-to-elasticsearch-null-values-in-array-data-objects/309965/2 "2022-08-16T01:45:38Z")
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